How to send an SMTP mail using SendGrid?

SendGrid (now owned by Twilio) is used by some of the biggest names in the industry such as Uber, Spotify, Yelp, Airbnb, and Kinsta. It originally started as a transactional email SMTP and API service designed for developers. They also offer email marketing features.

1. Go to https://app.sendgrid.com/settings/api_keys

2. Click Create API Key.

3. From the dialog select Restricted Access.

4. Enable the option Mail Send → Mail Send.

5. Once the API key is generated, keep it in a safe place. You cannot retrieve the same key again — you would need to regenerate a new one.

6. Use the following SMTP configuration in your application:

| Field | Value | |----------|-----------------------------------------------------------| | Host | smtp.sendgrid.net | | Port | 587 or 465 (SSL) | | Username | apikey (Yes, apikey is the username for all accounts) | | Password | API key generated in the above steps |

Code Sample

A sample C# application is available at:

https://github.com/arasu-rrk/sendgrid-smtp-client