Wireshark-users: Re: [Wireshark-users] Network Delay (SMTP)
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From: Richard Brodie <leogah@xxxxxxxxxxx>
Date: Thu, 31 Oct 2013 23:40:45 +0000
On 10/30/13 09:30, Roman Gelfand wrote:


Looking at the tcp stream, below, of a smtp conversation, it appears
there is 5 second delay before the actual smtp conversation begins.
It could be just a static delay to deter spambots but it might also be doing DNSBL lookups and timing out. Often (but not always) a delay is caused by a timeout 
on a side channel.

Richard