Set ISPConfig as an Email Relay for another ISPConfig Server

Discussion in 'ISPConfig 3 Priority Support' started by toyinal, Mar 8, 2016.

  1. toyinal

    toyinal Member HowtoForge Supporter

    Can I setup Postfix Relay in the ISPConfig Panel to act an Email Relay for another ISPConfig Email Server. Do I have to manually change postfix configuration file.

  2. till

    till Super Moderator Staff Member ISPConfig Developer

    Yes. Just add a transport in ISPConfig and then add either @domain.tld or all email addresses where relaying is allowed for under relay recipients. Please note that the domain shall not be added as email domain in this case.

  3. toyinal

    toyinal Member HowtoForge Supporter

    Thank you Till, I successfully setup a relay host in ISPConfig 3, but I have a problem, relayed mails are classifed as spam by Gmail & Yahoo. I read somewhere, that the Mail From (RFC5321) field should be relay host email address while the From:(RFC5322) field will the actual sender mail address. How to do this in ISPConfig 3.

  4. florian030

    florian030 ISPConfig Developer ISPConfig Developer

    Did you add the relay-server to your spf-record?
  5. toyinal

    toyinal Member HowtoForge Supporter

    I added the ip address of the relay host to originating server spf record, but the SPF check still fails. I own both the relay host and the originating server, but, emails from the relay host to the originating email server is not delivered, but is bounced with
    Undelivered Mail Returned to Sender
    <>: mail for loops back to

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