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Old 24th November 2012
comet--berkeley comet--berkeley is offline
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Default OpenSMTPD MTA error: 150 connection timeout

A mail server that I frequently send to decided to make all incoming connections wait
for 40 seconds before replying. (to slow down spammers?)

This broke the alpine MTA as well as breaking OpenSMTPD on OpenBSD 5.1-stable.

Alpine was fixed by adding a parameter to the .pinerc configuration:

tcp-open-timeout=50

This allowed the initial tcp connection from alpine to socket 25 to wait for 50
seconds before giving up.

Unfortunately I have no similar solution for OpenSMTPD.

I would like to be able to change a parameter in the smtpd.conf file and set the
mta tcp connection timeout to 50 seconds.

(RFC 5321 section 4.5.3.2 states "Timeouts SHOULD be easily reconfigurable, preferably without recompiling the SMTP code.")

From looking at the OpenSMTPD source code it appears that 10 seconds is hard coded for the timeout.
( function mta_enter_state(), io_set_timeout(&s->io, 10000); )

I will probably go back to using sendmail on OpenBSD where I can change a configuration parameter to fix the problem...
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Old 24th November 2012
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jggimi jggimi is offline
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Default

I recommend sending a note to gilles@ and eric@ regarding this.

OpenSMPTD is in development, and your requirement may already be on their to-do list.
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Old 25th November 2012
comet--berkeley comet--berkeley is offline
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Thanks jggimi.

I got a response from Gilles that he recognizes the problem and is trying to figure out the best way to allow for a configuration change.
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Old 28th November 2012
comet--berkeley comet--berkeley is offline
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I was able to fix the problem on my own.

While upgrading to 5.2-stable, I changed one line of code.

In /usr/src/usr.sbin/smtpd/mta_session.c:

old: io_set_timeout(&s->io, 10000);
new: io_set_timeout(&s->io, 300000);

So the timeout is 5 minutes instead of 10 seconds and it works fine.
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