On Tue, Oct 02, 2012 at 10:02:35AM +0200, Reindl Harald wrote: > Am 02.10.2012 02:56, schrieb Jason T. Slack-Moehrle: > >>> So it looks like incoming e-mail might be working now, outgoing > >>> not so much. > >> > >>> Oct 1 16:34:03 www postfix/smtp[3362]: connect to > >>> gmail.com[74.125.224.149]:25: Connection timed out > >> > >> This looks quite like a "disable_dns_lookups=yes" issue. The > >> question then would be: how was it working before? > > > > $ postconf -n > > disable_dns_lookups = yes > > > > I now changed it to 'no' and things seem to be working again. > > > > I dont understand why, though, this would be creating the > > problem. Could you explain? > > see docs: http://www.postfix.org/postconf.5.html#disable_dns_lookups > > disable_dns_lookups (default: no)
The higher-level explanation is that by using the getaddrinfo() system library routine, you are not able to look up the MX records which control mail routing. > > If it creates this problem, why do people set it? The better question: why did Jason set it? :) Don't change defaults if you don't understand them. > nobody does set it global > > it makes sense on internal transports like LMTP in > master.cf but NOT as global setting! > > dbmail-lmtp unix - - n - - lmtp -o disable_dns_lookups=yes -o > max_use=100 It might also simplify things in a relayhost + transport_maps configuration, but that is not really important. Bottom line here: Postfix comes with a lot of knobs and dials you can tweak and turn. Resist the urge. :) -- http://rob0.nodns4.us/ -- system administration and consulting Offlist GMX mail is seen only if "/dev/rob0" is in the Subject:
