Today I upgraded a machine from the older 2.7.x series to the latest
2.8.1 and found a difference. This is from Debian Sid.
My previous relayhost configuration was:
$ postconf relayhost
relayhost = [mail]
$ host -t a mail
mail.proulx.com has address 192.168.9.3
$ cat /etc/resolv.conf
nameserver 127.0.0.1
search proulx.com
That configuration has been working for quite a few years. But in
version 2.8.1 from Debian Sid I see that short host names without a
domain name are no longer resolved.
-Queue ID- --Size-- ----Arrival Time---- -Sender/Recipient-------
81CB02DC4D 1313 Wed Feb 23 13:22:36 b...@proulx.com
(Host or domain name not found. Name service error for name=mail type=A: Host
not found)
r...@example.com
Feb 23 13:22:36 hysteria postfix/smtp[18670]: warning: relayhost
configuration problem
Of course changing the relayhost to be any of the following corrects
the problem. (The last one "[mail.$mydomain]" is fine for me.)
relayhost = [192.168.230.3]
relayhost = [mail.proulx.com]
relayhost = [mail.$mydomain]
I browsed the changelogs and release notes but didn't see anything
that seemed to specifically address this topic.
The documentation says:
http://www.postfix.org/postconf.5.html#relayhost
On an intranet, specify the organizational domain name. If your
internal DNS uses no MX records, specify the name of the intranet
gateway host instead.
In the case of SMTP, specify a domain name, hostname, hostname:port,
[hostname]:port, [hostaddress] or [hostaddress]:port. The form
[hostname] turns off MX lookups.
Examples:
relayhost = $mydomain
relayhost = [gateway.example.com]
relayhost = uucphost
relayhost = [an.ip.add.ress]
Of course neither of the examples are short names and the words used
in the description don't say either. It has worked before. (shrug)
Is this an intentional change? Or just something that slipped in?
I am fine with it being an intentional change. But it had always
worked previously, I didn't find any explicit documentation of the
change, and so here I am asking for a clarification of intent.
Thanks!
Bob
