I need to setup postfix to relay using an SMTP server. There is no AUTH LOGIN so I do not need to setup the usual sasl_passwd file.
Telnet Successful
I can successfully use telnet to send an email from the SMTP server.
[1] telnet relayserverdomainFQDN 25
[2] EHLO
[3] MAIL FROM:voicemail@relayserverdomain.com
[4] RCPT TO:enduser@domain.com
[5] DATA – add body content
Postfix Setup Not Successfull
[1] Add this value to /etc/postfix/main.cf
relayhost = [relayserverdomainFQDN]:25
[2] postfix reload
[3] sudo -u asterisk mail -s TestEmail enduser@domain.com
Result: No relay. Email sent directly from server.