Configure postfix to use Sendgrid as default Relay

If you would like to configure postfix to use Sendgrid as the mail relay, you can do so by editing the postfix main configuration file.

vi /etc/postfix/main.cf

And then paste the content below at the end of the file :

smtp_sasl_auth_enable = yes
smtp_sasl_password_maps = static:username:password
smtp_sasl_security_options = noanonymous
smtp_tls_security_level = encrypt
header_size_limit = 4096000
relayhost = [smtp.sendgrid.net]:587

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