I've configured postfix on my Digital Ocean droplet to relay mail through mailgun and that much is working. Is there a way for me to send mail to Mailgun email address from email clients other than the server I've configured postfix on?

I'm guessing I need to open up the "smtpdrelayrestrictions" settings in /etc/postfix/main.cf to do so, but then (if I'm not mistaken) that would let anyone relay mail through my DO/mailgun account.

Can I mitigate that by having a route just trash the mail that isn't routed out to gmail or whatever?

Any help would be greatly appreciated.

Thank you.

Matt
seriousfunk@gmail.com