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Debugging a slow SMTP server connection problem
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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