On Wed, Jun 13, 2012 at 3:06 PM, Jan Stary <h...@stare.cz> wrote: > On Jun 13 19:39:46, Jan Stary wrote: >> Through my smtpd, I am sending an email to an address >> in the fjfi.cvut.cz domain. The email get delivered alright, >> but the maillog message is strange: >> >> Jun 13 19:32:08 mini smtpd[7138]: 93fe4a4f: from=<r...@mini.stare.cz>, >> size=427, nrcpts=1, proto=ESMTP, relay=0@localhost [IPv6:::1] >> Jun 13 19:32:10 mini smtpd[6586]: 93fe4a4f700df332: >> to=<jan.st...@fjfi.cvut.cz>, delay=2, relay=n003-000-000-000.static.ge.com >> [147.32.9.3], stat=Sent (2.0.0 Ok: queued as CECD3C0083) >> >> $ host -t mx fjfi.cvut.cz. >> fjfi.cvut.cz mail is handled by 70 brk1.fjfi.cvut.cz. >> fjfi.cvut.cz mail is handled by 30 mailgw1.fjfi.cvut.cz. >> fjfi.cvut.cz mail is handled by 50 mailgw2.fjfi.cvut.cz. >> fjfi.cvut.cz mail is handled by 60 brk2.fjfi.cvut.cz. >> >> So smtpd correctly chooses the first priority MX, which is >> >> $ host mailgw1.fjfi.cvut.cz. >> mailgw1.fjfi.cvut.cz has address 147.32.9.3 >> >> $ host 147.32.9.3 >> 3.9.32.147.in-addr.arpa domain name pointer mailgw1.fjfi.cvut.cz. >> >> All the resolvers in my /etc/resolv.conf resolve >> mailgw1.fjfi.cvut.cz. to 147.32.9.3 and back, as above. >> >> So how did "relay=n003-000-000-000.static.ge.com [147.32.9.3]" >> get into the log? Am I missing something? > > A different, but similarly strange thing happens with > an email to artax.karlin.mff.cuni.cz, which again resolves > fine to 195.113.26.195 and back, yet the log says > > Jun 13 20:34:55 mini smtpd[7138]: ee78679b: from=<r...@mini.stare.cz>, > size=449, nrcpts=1, proto=ESMTP, relay=0@localhost [IPv6:::1] > Jun 13 20:35:00 mini smtpd[6586]: ee78679b5ae80015: > to=<jsta6...@artax.karlin.mff.cuni.cz>, delay=5, relay=<unknown> > [195.113.26.195], stat=Sent (2.0.0 Ok: queued as 5A9C698085) >
I wish I knew the smptd codebase and/or had more time to become familiar; the DNS lookup for "relay" is being done using the wrong endianness. [david@mbp0 patch]$ host 147.32.9.3 3.9.32.147.in-addr.arpa domain name pointer mailgw1.fjfi.cvut.cz. [david@mbp0 patch]$ host 3.9.32.147 147.32.9.3.in-addr.arpa domain name pointer n003-000-000-000.static.ge.com. HTH --david
