On 2013-05-24 12:56, Sam Varshavchik wrote:
> Kristian Duus Østergaard writes:
>
>>
>>> When sending mail, Courier has no control over whether the remote mail
>> server issues its own ident query, Courier will wait 5 minutes for the
>> remote server's initial response, and that is configurable wth the
>> esmtptimeouthelo config setting. No but in my case the problem comes from
>> the combination that the sending server has a timeout of less than 30
>> seconds AND drops the ident packages making courier use the full timeout
>> of 30 seconds.
>
> Most receiving servers perform forward and reverse DNS lookup on the
> peer's IP address. This is even more popular than ident lookups. It's not
> uncommon for DNS lookups to stall for various reasons.
>
> When testing connections to remote servers, I find quite often that remote
> servers take a fairly long time to issue their greeting, even if the
> connection goes thru promptly, while they struggle with their own DNS
> servers.
>
> Senders which are so impatient are going to be fairly broken in many other
> ways, too.
I probably didn't write it - but I have a wireshark dump that proves that it
is the ident that times out. You are off course correct that it might very
well be broken in other ways.
Regards
Kristian
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