SendGrid sends email in two ways:- SMTP relay and Web API. SendGrid provides client libraries in many languages. SMTP has many features by default but is hard to set up. It also provides a tracking mail API. SendGrid manages all the technical details, from scaling the infrastructure to ISP outreach and reputation monitoring to services and real-time analytics.

Step by step guide on integration of SendGrid:

• Create an Account on SendGrid
  If you don't have an account on the SendGrid platform. you should create one Click Here

• Configure SendGrid credentials to an application
  You can update the env file with SendGrid credentials. Look at the below code after revising the env file
  

MAIL_DRIVER=smtp
MAIL_HOST=smtp.sendgrid.net
MAIL_PORT=587
MAIL_USERNAME=XXXXXXXXXXX
MAIL_PASSWORD=XXXXXXXXXXX

Read More