I found this link which hopefully explains the process of coupling postfix to Sendgrid for DigitalOcean customers.https://www.digitalocean.com/community/tutorials/how-to-install-and-configure-postfix-as-a-send-only-smtp-server-on-ubuntu-22-04at the top of the article they link to this: https://marketplace.digitalocean.com/apps/sendgridand finally found this on SendGrid's site: https://docs.sendgrid.com/for-developers/sending-email/postfix
Tigwyk @ Tigwyk @lemmy.vrchat-dev.tech Posts 58Comments 40Joined 2 yr. ago 
I found this link which hopefully explains the process of coupling postfix to Sendgrid for DigitalOcean customers.
https://www.digitalocean.com/community/tutorials/how-to-install-and-configure-postfix-as-a-send-only-smtp-server-on-ubuntu-22-04
at the top of the article they link to this: https://marketplace.digitalocean.com/apps/sendgrid
and finally found this on SendGrid's site: https://docs.sendgrid.com/for-developers/sending-email/postfix