Hello all,

We have postfix mta in our office to send e-mails to multiple recipients but we send individual messages via our hosting provider. In this respect, hosting provider made below setup in their system;

mx0 = mail2.domain.com.tr (hosting provider)
mx30 = mail.domain.com.tr (office static IP and rDNS)

Now, when we send emails from office and when the recipient replies back to this message, they get below error

his message was created automatically by mail delivery software.

A message that you sent could not be delivered to one or more of its recipients. This is a permanent error. The following address(es) failed:

SMTP error from remote mail server after RCPT TO:<bahadir@domain.com.tr>:
host mail.domain.com.tr [xx.xxx.xxx.x]: 554 5.7.1 <bahadir@supramar.com.tr>:
Relay access denied

When I checked wger.kernel.org output, below seen ;

250 2.1.0 Ok

Fine, it accepts NULL return-path as is mandated by RFC 2821 section 6.1

250 2.0.0 Ok
MAIL FROM:<postmaster@vger.kernel.org>
250 2.1.0 Ok
RCPT TO:<basar@domain.com.tr>
554 5.7.1 <basar@domain.com.tr>: Relay access denied

Something WRONG!! rc=554


Where I do wrong ?? Pleased to hear as this is a seious matter since we dont get a part of the messaged sent to our company.

Thanks in advance