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Mxx
Asked: 2012-07-27 07:24:05 +0800 CST

Postfix: How to accept email from a specific non-existing domain?

  • 772

We need to accept email from a server that sends out using a non-existing domain. That server is not under my control.

In my main.cf I have

smtpd_client_restrictions       = permit_mynetworks,
                              hash:/etc/postfix/access,
                              permit_sasl_authenticated

in /etc/postfix/access I have

<server's ip>                 OK
vps1.nonexistingdomain.com         OK

However, when I recieve messages from that server in my logs I see:

Jul 26 10:30:07 mail3 postfix/smtpd[24044]: NOQUEUE: reject: RCPT from vps1.nonexistingdomain.com[ip address]: 554 5.1.8 <[email protected]>: Sender address rejected: Domain not found; from=<[email protected]> to=<[email protected]> proto=ESMTP helo=<vps1.nonexistingdomain.com>

As another workaround I tried to manually hardcode this hostname:ip into my /etc/hosts, but that makes no difference.

linux

2 Answers

  1. Right now, probably:

    ~ $ sudo postconf smtpd_sender_restrictions
    smtpd_sender_restrictions = reject_unknown_sender_domain

    Should be?

    ~ $ sudo postconf smtpd_sender_restrictions
    smtpd_sender_restrictions = check_sender_access reject_unknown_sender_domain

    option set in main.cf
    You'll need to postalias /etc/postfix/access if you haven't already.

    Also, chastise the sender for not owning the domain they're sending from (or not having had created the appropriate subdomain).

    • 7
  2. Best Answer

    In /etc/postfix/main.cf, place the server's IP address in mynetworks.

    Example (where the IP addres is 198.51.100.43):

    mynetworks = 127.0.0.0/8 [::ffff:127.0.0.0]/104 [::1]/128 198.51.100.43
    • 3