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Debugging a slow SMTP server connection problem
Authored by: grahamgillett on May 23, '08 12:49:55AM
I am not sure if this will be of help to anyone but I too experienced this problem with slow SMTP connections.

Mac OX X Version 10.5.2

Mac Mail Version 3.2

In my case, however, I am my own ISP and the problem was brought to my attention by one of my small business clients after a hardware and corresponding software upgrade.

On my co-located server I use the Exim MTA and after Googling 'exim identd' found the following question 'Q0020' in the Exim FAQ:

http://exim.dsmirror.nl/exim-html-4.40/doc/html/FAQ_0.html#TOC20

A look in the Exim config file revealed this entry:

# The settings below, which are actually the same as the defaults in the
# code, cause Exim to make RFC 1413 (ident) callbacks for all incoming SMTP
# calls. You can limit the hosts to which these calls are made, and/or change
# the timeout that is used. If you set the timeout to zero, all RFC 1413 calls
# are disabled. RFC 1413 calls are cheap and can provide useful information
# for tracing problem messages, but some hosts and firewalls have problems
# with them. This can result in a timeout instead of an immediate refused
# connection, leading to delays on starting up an SMTP session.

rfc1413_hosts = *
rfc1413_query_timeout = 30s

Changing rfc1413_query_timeout to:

rfc1413_query_timeout = 0s

solved my problem.




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