Set the authorization credentials in /etc/mail/access
AuthInfo:smtp.sendgrid.net "U:apikey" "P:<yourAPIKey>" "M:PLAIN"Define the Smart Host in /etc/mail/sendmail.mc.
You should add these lines just after the commented \#dnl define('SMART_HOST', 'smtp.your.provider')dnl line in the file. In Ubuntu these would be the last lines added to the file.
define(`SMART_HOST', `smtp.sendgrid.net')dnl
FEATURE(`access_db')dnl
define(`RELAY_MAILER_ARGS', `TCP $h 587')dnl
define(`ESMTP_MAILER_ARGS', `TCP $h 587')dnlUpdate sendmail.cf and access.db files
Run these commands as root:
$ cd /etc/mail
$ m4 sendmail.mc >sendmail.cf
$ makemap hash access.db < accessRestart Send Mail
$ service sendmail restart--
https://docs.sendgrid.com/for-developers/sending-email/sendmail
Technologies: