How to send an SMTP mail using SendGrid

Originally published on arasu-rrk.com.

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