Postfix mail for domain.com loops back to myself Error and Solution

by on May 1, 2009 · 5 comments· LAST UPDATED June 2, 2009

in , ,

I can send and receive mail using user@example.com, but system generated emails such as root@mail.example.com bounce backup with an error:

May 1 03:14:52 mail postfix/smtp[62798]: 23CA4BD6B40: to=, relay=none, delay=0.01, delays=0/0/0/0, dsn=5.4.6, status=bounced (mail for mail.example.com loops back to myself)

How do I fix this error?

Postfix did found a dns reply to your email server, but it hasn't been configured to deal with address such as root@mail.example.com. In other words, your server is configured to accept user@example.com but not as user@mail.example.com. This is well known config problem with virtual domain. To fix this error either add system FQDN to mydestination or relay_domains. Postfix accepts mail for domain listed in virtual_mailbox_domains, virtual_alias_domains, and domains that resolve to IP addresses listed in inet_interfaces and proxy_interfaces. Update mydestination using postconf or by editing main.cf file:

mydestination = localhost.$mydomain, localhost, mail.example.com

Once done reload postfix:
# service postfix reload

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{ 5 comments… read them below or add one }

1 Andrés Chandía October 26, 2009 at 8:40 pm

I’ve done it but does not works for me, this is what i got:
at /etc/postfix/main.cf
myhostname = example.tdl
myorigin = /etc/mailname
mydestination = example.tdl, localhost, localhost.localdomain

at /etc/mailname
example.tdl

at /etc/hostname
example.tdl

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2 zazuge December 5, 2012 at 1:39 pm

another cause is when you have too mail servers with same hostname
it happened for me
watch out for “greeted me with my own hostname”
@Andrés Chandía
i don’t think that is a FQDN
I proper FQDN is “myhost.mydomain.com.”
or even “myhost.mysubdomain.mydomain.com.”
though it depends if the trailing dot is inluded or not
the important thing is that if you do a ping or nslookup
you get your host (the mail server)
from anywhere in the interenet (the FQDN must be unique)

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3 jomo June 2, 2013 at 9:14 pm

Thanks — short and sweet answer. Worked for me.

Reply

4 Mac October 15, 2013 at 10:15 pm

Fixed it finally, added in the following:

mydestination = $myhostname, localhost.$mydomain, localhost, $mydomain

added $mydomain and it worked perfectly!
thanks!

Reply

5 avi March 2, 2014 at 10:40 pm

Commenting out the line:

relay =

will do it too

Reply

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