FreePBX 15.0.37.9 - SMTP Setup

I’m using FreePBX 15.0.37.9.

The previous admin had setup outgoing emails for delivery of VMs. He is currently on PTO and not reachable. My outgoing emails have stopped working. Mails are getting piled up in mailq.

/etc/postfix/main.cf has relayhost setup to mail.mydomain.com
But maillog shows mails trying to be sent via amazonses.

There is no paid module on my FreePBX.

I’m struggling to figure out where the outbound email (SMTP) setup is done.

Anyone can point me in the right direction please?

Thanks

admin > system admin > email setup.

@ashcortech Thanks for your reply. I don’t have “Email” option under admin > system admin.
Any other suggestions?

purchase the sysadmin pro module from sangoma.