From mboxrd@z Thu Jan  1 00:00:00 1970
Message-ID: <825ab1b11c6efdfedc86a4826906ef65@quintile.net>
From: "Steve Simon" <steve@quintile.net>
Date: Mon, 15 Jan 2007 23:35:48 +0000
To: 9fans@cse.psu.edu
Subject: Re: [9fans] $smtp dns failure
In-Reply-To: <88a477560701151202x7491769dwd738d2284ebccbe2@mail.gmail.com>
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re smtp dns problems:

Hi,

Debugging smtp: check the exact way upas/smtp is being envoked.
Look at the end of /sys/mail/runq, here is an example from mine:

	felix Jan 12 19:33:36 steve/C.095795: execing '/mail/lib/remotemail' 'smtp' 'steve' 'net!$smtp' '9fans@cse.psu.edu'

Then you can try running the remotemail script with rc -x to see
what it is doing, in my example:

	rc -x '/mail/lib/remotemail' 'smtp' 'steve' 'net!$smtp' '9fans@cse.psu.edu'
    ...
	exec /bin/upas/smtp -g 'net!$smtp' -h quintile.net 'net!$smtp' steve 9fans@cse.psu.edu

Finally you can exec smtp with the -d option (debug) to see the SMTP conversation,
and perhaps more importantly the DNS lookups (and failures) that occur.

----------------------

I used to put this in my /mail/lib/remotemail:

	exec /bin/upas/smtp -h $fd $addr $sender $*

But due to a weird bug in the DNS cache (that I couldn't find even after
several attempts) mail would fail, so I changed (at Russ's advice) to

	exec /bin/upas/smtp -g $addr -h $fd $addr $sender $*

and email has worked fine since.

-Steve