I've been searching the forums and haven't been able to solve this.
My Zimbra server only has to allow outgoing email if users are authenticated or through the web client.
mynetworks = 127.0.0.1/8
I read somewhere in here about tinkering with master.cf.in:
smtpd_recipient_restrictions = reject_non_fqdn_recipient, permit_sasl_authenticated, permit_mynetworks, reject_unauth_destination, reject_unlisted_recipient, reject_invalid_hostname, reject_non_fqdn_sender, reject_unknown_sender_domain, reject_rbl_client cbl.abuseat.org, reject_rbl_client sbl.spamhaus.org
And changed it to this:
But users from the web client can't send email, so I changed it back.
As of now, users can send email only if their email client use authentication and through the web client, but I'm still able to send email through Telnet to port 25.
Any ideas will be greatly apreciated.