Quite likely to be identd lookups timing-out:
# 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 SMTP sessions. (The default was
# reduced from 30s to 5s for release 4.61.)
rfc1413_hosts = *
rfc1413_query_timeout = 5s
--
Merlin Hartley
IT Systems Engineer
MRC Mitochondrial Biology Unit
Wellcome Trust/MRC Building
Cambridge Biomedical Campus
Cambridge
CB2 0XY
UK
> On 29 Oct 2015, at 04:56, Joshua Schulenberg <joshua.schulenberg@???> wrote:
>
> I am having a problem with sending delays. I have tried whitelisting the
> sending host and turning off several things, but there seems to be about a
> 15 second delay when sending even a short message. Is this a common problem
> - is there something I should check in the configuration?
>
> Thank You.
>
> -josh
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