Opiniones de SendGrid

Sobre SendGrid

SendGrid es la plataforma líder de entrega de correo electrónico en la nube, en la que confían más de 78 000 de las marcas de más rápido crecimiento del mundo.

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Puntos a favor:

The software is powerful and while advances it’s quite easy to get a hang of.

Puntos en contra:

The customer support was the worst I have ever experienced.

Valoraciones de SendGrid

Evaluación media

Facilidad de uso
4,1
Atención al cliente
3,8
Funcionalidades
4,1
Relación calidad-precio
4,0

Probabilidad de recomendación

7,5/10

SendGrid tiene una valoración global de 4,2 estrellas sobre 5 según las 603 opiniones de usuarios de Capterra.

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Eddie
Eddie
CEO
Usuario de Linkedin verificado
Aprendizaje en línea, 2-10 empleados
Ha utilizado el software durante: Más de dos años
Fuente de la reseña

E-mail Marketing optimized for Professionals

5,0 el año pasado
Los subtítulos en español están disponibles en el reproductor de vídeo
Usuario verificado
Responsable de marketing online en España
Usuario de Linkedin verificado
Productos cosméticos, 51-200 empleados
Ha utilizado el software durante: Más de dos años
Fuente de la reseña

Una buena herramienta para tu email marketing

5,0 el mes pasado Nuevo

Puntos a favor:

Nosotros la usamos principalmente vía API conectadas a las web que tenemos de Prestashop y nos garantiza,os ademas que vayan los correos perfectamente a la bandeja de entrada

Puntos en contra:

No hay nada que no nos guste de este servicio ya que nos da buenos resultados

Guillermo
Guillermo
Gerente en España
Usuario de Linkedin verificado
Salud, bienestar y deporte, 11-50 empleados
Ha utilizado el software durante: Más de dos años
Fuente de la reseña

Alternativas consideradas:

Excelente para integrar con Click funnels

4,0 hace 3 meses

Comentarios: Muy buena para integrar con Click funnels

Puntos a favor:

He adquirido esta herramienta para poder integrar correos en Click funnels y no me arrepiento, la funcionalidad que tienen juntos es muy buena, además sus precios por cantidad de clientes es competitiva

Puntos en contra:

Mejorar un poco el entorno gráfico para apreciar las estadísticas de los correos

Usuario verificado
Full-stack Developer en México
Usuario de Linkedin verificado
Desarrollo de programas, 11-50 empleados
Ha utilizado el software durante: Más de dos años
Fuente de la reseña

Si tú eres el desarrollador y necesitas enviar correos o mensajes, esta es una gran opción.

5,0 hace 2 años

Comentarios: En general cuando trabajo con sengrid hago las plantillas y solo agrego en código la llamada al api de sengrid para utilizar esas plantillas nuevas donde las necesito, o en su defecto entro en alguna plantilla para editar o cambiar el tamaño de texto o tipo de letra. Pero en general, una vez configurado todo, no hay que hacerle casi nada al código que maneja sengrid; es una sensación muy agradable el saber que si la implementación es la correcta (y documentada) no hay que volver a re trabajar en el proceso de envíos de emails.

Puntos a favor:

La implementación en tecnologías como la son .net core y .net 4.5 es increíblemente amigable, no hay forma de que siguiendo el simple tutorial en la misma página web de sengrid puedas terminar confundido; simplemente agregas el nuget desde visual studio, agregas en tu código (o haces una clase genérica), las llaves necesarias que te proporcionan a través de tu perfil como más. Puedes agregar tu url y datos de empresa para evitar que tus correos terminen como spam en el correo de tus clientes. Además, la forma en que se pueden editar las plantillas y sustituir ciertos bloques del contenido por texto o algún otro dato que generes en código es también muy sencillo y cómodo.

Puntos en contra:

En ocasiones la IU de la interfaz de la edición de las plantillas para en estado “Legacy” es lenta, y en algunos casos el generador de plantillas (el nuevo) se cofunde un poco en el orden de los componentes según se arrastran a la pantalla, pero con un poco de practica se le agarra el chiste.

marlyn
marlyn
gerente en España
Usuario de Linkedin verificado
Salud, bienestar y deporte, 11-50 empleados
Ha utilizado el software durante: 1-5 meses
Fuente de la reseña

Si necesitas enviar campañas a tus suscriptores esta es una buena opción

4,0 hace 3 meses

Comentarios: En general todo ha ido bastante bien sin embargo es difícil obtener soporte si estás en la fase de prueba gratuita, y esto le resta calidad.

Puntos a favor:

Se integra fácilmente con muchos otros software de marketing por correo electrónico, es muy fácil de configurar y mejora la entrega de correo electrónico, yo he logrado la integración con clickfunnel y ha ido todo bien.

Puntos en contra:

Algo que podrían mejorar es el menu ya que no agrada mucho desde el punto de vista visual.

Usuario verificado
Empleado en Colombia
Usuario de Linkedin verificado
Educación primaria/secundaria, 1.001-5.000 empleados
Ha utilizado el software durante: Prueba gratis
Fuente de la reseña
Fuente: GetApp

No se puede crear una cuenta

1,0 el mes pasado Nuevo

Comentarios: Muy malo todo. No pude crear la cuenta.

Puntos a favor:

No me gusta nada. Cuando no se puede crear una cuenta y te rechaza todas las opciones, no se puede considerar un buen producto.

Puntos en contra:

No me gusta en absoluto. No pude crear la cuenta.Cuando no se puede crear una cuenta y te rechaza todas las opciones, no se puede considerar un buen producto.

ZAiN
ZAiN
Web Developer en Arabia Saudí
Usuario de Linkedin verificado
Tecnología y servicios de la información, 2-10 empleados
Ha utilizado el software durante: Prueba gratis
Fuente de la reseña

Alternativas consideradas:

Does what it says on the box

5,0 hace 4 semanas Nuevo

Comentarios: My email deliverability and response rates have drastically improved due to customers receiving my transactional emails.

Puntos a favor:

Integration is dead easy and the free tiers are fantastic for small businesses and to try out the software.The Marketing Campain feature is great.Documentation is comprehensive as well. The real time analytics and reporting is fantastic.

Puntos en contra:

Payment issues and customer service response times are a bit of an issue.

Nicolas
IT Administrator en Francia
Tecnología y servicios de la información, 2-10 empleados
Ha utilizado el software durante: 6-12 meses
Fuente de la reseña

Send email easely to yours lists

5,0 hace 4 semanas Nuevo

Comentarios: We already use our own software to manage mailing list so we use this only in email delivery and SMTP : it's a very good product for that - SMTP is not a pain to configure and delivery go to inbox in most of the cases

Puntos a favor:

very easy to use. we don't need any list management so review is only for SMTP and email delivery. This solution make great job and it's really very good to deliver compared to other product.

Puntos en contra:

Sometime, mail could take some minutes before being send so that could be an issue for transactional email.

Alois
CEO en Austria
Aprendizaje en línea, 11-50 empleados
Ha utilizado el software durante: 6-12 meses
Fuente de la reseña

Alternativas consideradas:

Terrible Product and much to expensive for what you get!

2,0 hace 2 meses

Puntos a favor:

If you setup everything and subscribed to one of the most expensive plans you can send mails -_- thats all!

Puntos en contra:

The price is not the problem but what you get is a half finished product. In the first few months sending mails did not work at all. No error message. Nothing! We realized ofter customer complains. There is no double optin feature at all. The best way is to use custom fields and developer who writes additional scripts to handle the customer fields. The automation is terrible. You can only send emails after an fixed interval of 3 days. No option to change that. No option to send maisl after a click. Not even an option to delete emails in series of mails. You have to start a complete new automation. Adding just a delete button would saves hours!

Orianne
Orianne
Specialist Marketing en España
Usuario de Linkedin verificado
Telecomunicaciones, 10.000+ empleados
Ha utilizado el software durante: Más de un año
Fuente de la reseña

Sending SaaS emails through the service is the best option.

4,0 hace 3 meses

Comentarios: Minimal running costs and the minimal need for application development make the API cost-effective. Even as a simple SMTP gateway, the API can perform many functions. These include distribution results and bounce information, which make the proper operation possible. MTA SaaS services are made possible by the original. It is used to display messages from the service provider and notify the public of upcoming announcements. Nowadays it is difficult to operate with an original because it could be used by malicious third parties as a spam pass-through. However, it can operate securely if appropriate security measures and patches are applied frequently. Using the SendGrid service frees business owners from work they cannot control.

Puntos a favor:

With the sub-user functions and the ability to manage each distribution case, it is easy to confirm the rate and track each delivery in the dashboard. In addition, it is easy to ensure bounce time records and investigate why mail was not delivered from the dashboard. This is because each case has a dedicated distribution manager that can perform distribution management in each case. It is advisable to confirm delivery with a tracking code, but it is also possible to check mail confirmation without any further action. This process can be completed quickly with any of the services offered.

Puntos en contra:

Since the records of previous bounces disappear when searching, I want to extend the logging period a bit. To extract the data through webhooks, making a request each time is necessary.

Emilia
Communications Coordinator en Finlandia
Contabilidad, 11-50 empleados
Ha utilizado el software durante: 6-12 meses
Fuente de la reseña

Good software for email marketing

4,0 el mes pasado Nuevo

Comentarios: All in all, a really easy tool for weekly or monthly email marketing. Thanks to the lists, messages can be targeted to different user groups.

Puntos a favor:

A straightforward and convenient tool for email marketing. In the preview phase, you can see how the email looks on different devices. That is very useful.

Puntos en contra:

The platform's email editing tools are too simple. If you want finer and more elegant features, you should code them, depending on which feature you want.

Pranjal
Co founder en India
Producción audiovisual, 11-50 empleados
Ha utilizado el software durante: Más de dos años
Fuente de la reseña

Alternativas consideradas:

More about deliverability and less about total email marketing solution defines sendgrid.

4,0 hace 2 meses Nuevo

Comentarios: Sendgrid is great with delivering emails and is undisputed in transactional emails . Use it for its top notch deliverability, reporting and analytics as no other application even comes close to it in these areas but as a total email marketing platform; it lacks behind as it has very few campaign automation features, it is difficult to get used to and has a poor customer support. It is also slightly more expensive than others and falls in the middle of the lineup in terms of pricing.

Puntos a favor:

Deliverability, reporting and analytics and email validation are the areas where sendgrid is at the top. It even tells you if the email ids you are sending emails to are active or are misspelled or are disposable. It has excellent reporting features and lets you know the emails which bounced, got opened or got unsubscribed. Its email editor is good wherein you can edit existing templates using drag and drop features and you can also use tags for sending personalised emails.

Puntos en contra:

Campaign automation, segmentation of contact lists are severe drawbacks of this application. There is hardly anything you can automate in terms of automating your campaigns or automating when to send emails on certain action points.

Usuario verificado
Web Developer en EE. UU.
Usuario de Linkedin verificado
Tecnología y servicios de la información, 2-10 empleados
Ha utilizado el software durante: Más de un año
Fuente de la reseña

Powerful

5,0 hace 2 meses

Comentarios: Customer support has been very knowledgable and supportive when I've talked to them.

Puntos a favor:

We use SendGrid only for transactional emails, and its great.

Puntos en contra:

Wish pricing for dedicated IPs wasn't so expensive. Wish email templates could be organized into folders - for example, a folder for Client A that contains templates for Signup, Password Reset, etc, and then repeated.

Palla
Blogger en India
Internet, 11-50 empleados
Ha utilizado el software durante: 6-12 meses
Fuente de la reseña

I doubled my conversion rate using SendGrid Email Management

4,0 hace 2 meses

Comentarios: I like the analytics and personalization features of SendGrid. I can easily Email lists from any file format and send emails to the right customers.

Puntos a favor:

Creation of forms and building templates. Sending emails to the right users. Spam block and authentication email Email campaign management

Puntos en contra:

Cost is little pricey. Lack of advanced segmentation features

Isak
Developer en Suecia
Tecnología y servicios de la información, 11-50 empleados
Ha utilizado el software durante: 6-12 meses
Fuente de la reseña

Easy to setup and use - but low delivery performance

4,0 hace 2 meses

Comentarios: We used SendGrid as our email-provider for transactional emails. We had problems with our delivery rate with a lot of mails not arriving or ending up in junk. SendGrid support advised use a dedicated IP - requiring us to pay a lot more with unsatisfying results. We recently made the switch to AWS Simple Email Service.

Puntos a favor:

The Sendgrid API documentation is well-written and easy to understand. Easy to install on Heroku as an addon.

Puntos en contra:

Low delivery rate for emails that often ended up in junk mail.

Usuario verificado
Technical Lead - Data Analytics en EE. UU.
Usuario de Linkedin verificado
Software informático, 11-50 empleados
Ha utilizado el software durante: Más de dos años
Fuente de la reseña

Alternativas consideradas:

Reliable, high-bandwidth, and reasonably priced

5,0 hace 6 meses

Comentarios: Overall, SendGrid has been a very valuable asset for our company. Even when we are not fully using every available feature, it's never failed us at a crucial moment, and continues to be a reliable and reasonably priced solution for us.

Puntos a favor:

Our help desk/support team skews more to the "client's industry specialist" side and less to the tech savant end. That being said, SendGrid continues to be simple to use tool for those that interact with it daily. Setup and further customizations have been simple, and over the course of 10 years, it has continued to prove its value with minimum service inturruptions.

Puntos en contra:

Our team's only major complaint during our ensure using SendGrid was mostly when it was a less mature product. There were some shortcomings early on with the email marketing and contact management, but there has been considerable progress and improvements in almost all corners of their service and UI.

Rahul
Rahul
Chief Technical Officer en India
Usuario de Linkedin verificado
Tecnología y servicios de la información, 2-10 empleados
Ha utilizado el software durante: Más de un año
Fuente de la reseña

Alternativas consideradas:

Most Underrated Powerful Email Marketing Tool

5,0 hace 7 meses

Comentarios: Sendgrid is a powerful email marketing tool that offers superior services to its customers. Sendgrid is a must-have tool for start-ups, eCommerce businesses, freelancers and corporates. One thing that separates Sendgrid from other email marketing tools is their scalability once our list grows. The free version of Sendgrid allows you to send 100 emails every day.

Puntos a favor:

What I like most about Sendgrid is that most of the tools out there offer easy integration with Sendgrid. Some apps can even directly integrate with SendGrid without using automation software like Zapier.

Puntos en contra:

Sendgrid's UI is a bit confusing and it took some time to get used to the options. The email editor lacks certain features.

Pius
Founder en Uganda
Internet, 2-10 empleados
Ha utilizado el software durante: Más de dos años
Fuente de la reseña

Alternativas consideradas:

SendGrid

5,0 hace 7 meses

Comentarios: Sendgrid handles all my mailing campaigns and I have stuck with it from day one to date. I like the email deliverability and tracking metrics offered by SendGrid and will stick with it for the foreseeable future as everything works smoothly.

Puntos a favor:

It was very easy to integrate with my existing stack. SendGrid has really worked hard to make sure it's easy to use their software with other services out there. Most website builders by default ask you to integrate Sendgrid as your emailing service, and that was the case with my website builder. It was really easy for me to get started as all I had to do was add an API key in a provided input field. SendGrid did all the heavy lifting and I did not have to do any coding or even go through the API documentation(which by the way is very comprehensive ). You fill that that is the case in so many services that integrate with SendGrid, integration is light-work.

Puntos en contra:

It is a little expensive, especially when sending a tonne of emails out and having a lot of contacts. Your email totals low-key add up when you have multiple drip campaigns and transactional emails set up. If you have a small budget it's really difficult to get measurable success on SendGrid as I found out when I just started while having a very low budget. The best way to get the best out of SendGrid is with a substantial budget, and that's a bummer when starting out.

Dome
Digital Director en Italia
Software informático, 2-10 empleados
Ha utilizado el software durante: Más de un año
Fuente de la reseña

Alternativas consideradas:

That's the best smtp software you can get for your buck

5,0 el año pasado

Comentarios: i would recommend sendrgrig to everyone my mum included. It's just the best smtp provider if you consider money and value

Puntos a favor:

ok this is not a free software but you can get all you want: just smtp or stats and more.. what I really enjoyed was the stats service.. If you run an e-commerce you'll be familiar with the question: "did my customer got the email?" well with sendgrid you can actually answer that question. You'll have a full report and you can easily tell if your customer got the email or something went wrong. This is something just invaluable.

Puntos en contra:

This is not a pricy software but you need to understand its value. if your business is not big enough maybe it will be hard to sustain. nevertheless i just can say this is the place to look even if you have a small business. unless you want to take the burden of handling smtp this software is just awesome.

Vishal
Vishal
Technical Manager en India
Usuario de Linkedin verificado
Tecnología y servicios de la información, 11-50 empleados
Ha utilizado el software durante: Más de dos años
Fuente de la reseña

Alternativas consideradas:

SendGrid - Best Email API for sending marketing emails

5,0 el año pasado

Comentarios: I use SendGrid for sending communication and marketing emails to thousands of customers every day. Sending close to 100,000 emails per month and the quality of service is quite good. Must say I am happy to use SendGrid.

Puntos a favor:

The best thing about using the SendGrid Email API was the performance measured in terms of email deliverability and server uptime. The dashboard provides good insights with respect to number of emails sent, delivered and opened. Thus helps a great deal in improving marketing campaigns. From the deployment point of view, the integration of SendGrid with the existing email service was quite easy and can be completed easily without great efforts.

Puntos en contra:

As far as technical aspects are concerned, there is nothing which I don't like. On the pricing front, would like to add my views. Currently, the pricing plans are available as Free (100 emails per day), Essentials and Pro. The Essentials plan starts from 14.95$ per month for upto 40,000 emails a month and the Pro starts at 89.95$ per month. These plans are good for small and medium size websites. Would be good to see if a new Basic plan is introduced for a low starting price of 4.95$ per month and offering upto 10,000 emails a month. Such a plan would be highly suitable for extra small website applications who have a limited customer base.

Eddie
Eddie
CEO en EE. UU.
Usuario de Linkedin verificado
Aprendizaje en línea, 2-10 empleados
Ha utilizado el software durante: Más de dos años
Fuente de la reseña

Alternativas consideradas:

E-mail Marketing optimized for Professionals

4,0 el año pasado

Comentarios: SendGrid is a tool made for those looking for industrial strength e-mail marketing. If you have a small list and want a free tool where you have many templates and can drag and drop designs, MailChimp is the right tool. However, if you are sending millions of e-mails and want to use code and highly technical attributes with tens of thousands of users in your e-mail list you pretty much have to abandon MailChimp and SendGrid is the best tool in the space

Puntos a favor:

The code editor and how everything is optimized for coding allows for truly beautiful e-mail marketing campaigns. SendGrid can accommodate beautiful e-mail templates that were created in HTML/CSS, you just have to know how to code for it to be useful for you.

Puntos en contra:

They do not have a way to graphically edit particularly easily like with MailChimp. To make a good looking e-mail marketing campaign you must know how to code, there are not a lot of templates provided for you to edit or drag and drop. It was not intended as a tool if you would like to drag and drop. On the upside this got us to learn how to code better.

Oscar
Oscar
Gerente general en Perú
Usuario de Linkedin verificado
Software informático, 2-10 empleados
Ha utilizado el software durante: Más de dos años
Fuente de la reseña

Alternativas consideradas:

The best mail service provider for marketing and transactional emails.

5,0 hace 4 años

Comentarios: I have been working with Sendgrid for more than 2 years and it really has been very helpful. It's perfect when you need to send transactional mails, for example password recovery or notifications to users from your website. or custom marketing campaigns. You can implement on your App easily with his Full Documented API or via SMTP. The free forever plan is perfect when you're starting a website or application and still do not have enough users. You can also easily upgrade your plan in order to get more emails monthly . Recommended with closed eyes.

Puntos a favor:

1. Have AB Testing enable. 2. Manage unsubscribe emails. 3. Easy to Integrate via API or SMTP. 4. Email Reputation indicator. 5.Full detailed report. You can see if the email it's blocked, bounced or delivered. 6. Have a Forever Free plan . (40.000 Emails in the trial period, then 100 Emails Daily forever)

Puntos en contra:

Send grid interface it's a little bit confuse. No more cons to highlight, for me it's a perfect tool.

Mckenzie
Java Developer en EE. UU.
Servicios de información, 10.000+ empleados
Ha utilizado el software durante: Más de dos años
Fuente de la reseña

Alternativas consideradas:

Effective Emailing tool

5,0 el año pasado

Comentarios: Excellent

Puntos a favor:

We use sendgrid for our enterprise application for all purpose ranging from notification, verification and transactional information. We switched from a competitor that was burning our pockets and had a lot of issues. the pricing was a balance between our budger and our requirements and send grid just fit into the grid for us

Puntos en contra:

No complaints. However the suggestion to the manufacturers would be to improvise the documentation for this product to provide more use case specific guidance to help users

Nurul Aishah
Nurul Aishah
Personal Banker en Malasia
Usuario de Linkedin verificado
Servicios financieros, 5.001-10.000 empleados
Ha utilizado el software durante: Más de dos años
Fuente de la reseña

Simplified email service

5,0 el año pasado

Puntos a favor:

Our business application uses Sendgrid for various purposes, including notification, authentication, and transactional data. We migrated from a competitor that was draining our bank accounts and causing a slew of problems. The cost was a good match for our budget and objectives, and the send grid was a perfect fit for us. They provide some handy online manuals to get you started, as well as a variety of configurable options to make sure the device is suitable for you.

Puntos en contra:

It requires greater adaptability and customization tools to be successful in the long run. I couldn't discover a method to adjust automatic track in UTMs; it can only be activated or deactivated, which isn't convenient. The integrating and installation procedure were the most challenging aspects of implementing Sendgrid for us. However, customer assistance and YouTube tutorials were beneficial.

Abigail
Abigail
Founder en Kenia
Usuario de Linkedin verificado
Ha utilizado el software durante: 1-5 meses
Fuente de la reseña

An Easy to Use Email Marketing Software

5,0 hace 4 años

Comentarios: The detailed stats from each email campaign is amazing, and the Unsubscribe groups option really helped with GDPR compliance

Puntos a favor:

1. On the bottom left side of the dashboard is a small reputation percentage bar, that measures your reputation. The bar is updated daily based on your email sends, your reputation goes down if your email bounces or is marked as spam. 2. Stats: SendGrid provides A LOT of data on the performance of your email campaigns, these stats are: Requests, Delivered, Opens, Unique Opens, Clicks, Unique Clicks, Unsubscribes, Spam Reports, Bounces, Blocks, Bounce Drops, Spam Report Drops, Unsubscribe Drops and Invalid Emails. SendGrid also provides stats such as: Global Stats, Category Stats, Category Comparison, Subuser Stats, Subuser Comparison, Geographical, Email Clients & Devices, Mailbox Provider Stats, Mailbox Provider Comparison, Browser Stats, and Browser Comparison 3. A/B Testing 4. Unsubscribe Groups: This is without doubt my favorite feature from SendGrid. When you click on "Marketing" on the left side of your dashboard, and select tour from the drop down, it sort of lists steps to set up for sending marketing emails. Step 3 on the list of things to do is to create unsubscribe groups. Here you can Create groups that represent types of email that you regularly send to your recipients. If a recipient chooses to unsubscribe, they will have the option of selecting which of these groups they want to unsubscribe from.

Puntos en contra:

1. The Email templates in SendGrids gallery are a bit basic which initially wasn't a problem as I liked creating my own template, but I did not like how I couldn't modify the "columns" module to my taste. I wanted to create a template with three columns with the center column bigger than the two on the side. The idea was to have my client's images linking to their projects (On their websites) on the side columns, with the write up in the center column. However, that couldn't be done (At least so far it seems so as I can't find any option to tweak the size/width of each column) as each column has an equal width. 2. No automation function: I'd like to create a sort of If/Then sequence where I can resend an email to a group of people after x days, for example, I'd like to resend an email (With a different heading of course) to people who have not opened the first email after four days.

Anatoly
Anatoly
Founder & CEO en EE. UU.
Usuario de Linkedin verificado
Servicios de información
Ha utilizado el software durante: 6-12 meses
Fuente de la reseña

SendGrid offers a great transactional email API, but deliverability & support issues hold it back

4,0 hace 4 años

Comentarios: Easy integration into our platform and deliverability metrics. Dedicated IP, if you pay for it.

Puntos a favor:

We use SendGrid for transactional emails, such as welcome messages & notifications. Generally, SendGrid offers great tools to integrate emails into a variety of different application platforms and programming languages. We really like its level of detail when checking on the status of emails. Sendgrid is also free for basic transactional emails, which makes it easy to try and ensure it will work with your application. We use a third-party library called Nodemailer with Sendgrid, so switching from a different service to Sendgrid was trivial.

Puntos en contra:

While the service is easy to use and offers comprehensive email activity metrics, there are a few things about it we didn't like. First, because the free tier uses shared IPs, we consistently had emails that wouldn't get delivered because of IP blocks. There were a handful of IPs that we had that experience with, and it persisted for weeks -- without any support intervention. Sendgrid must have deliverability metrics on their side as well, so I am surprised they didn't drop these IPs from their IP pool proactively. We had to upgrade to the PRO plan, which was the least expensive plan that had a dedicated IP. We also had to pay extra for 30 days of email history, you get 3 days by default. I'd love to see all these options be a-la-carte, but I get that you need to make revenue somehow, and few companies send enough emails to justify jumping to the next paid plan -- unless you NEED that deliverability guarantee that you get w/ dedicated IPs, which we did.