As Eric correctly guessed, it's linked to the 'greeting-delay-secs'
setting in Spamdyke. I was able to confirm this by changing the value of
the setting and retesting. The times reported by the testing tool
closely matched the values that I entered for 'greeting-delay-secs'.
(Pro tip: you can significantly reduce the load on your mail server by
setting 'greeting-delay-secs' to 30 seconds or more. Of course, you'll
also never receive any mail ever again, but hey, there's always a
tradeoff).
The Spamdyke documentatation:
https://www.spamdyke.org/documentation/README.html#EARLYTALKERS
suggests that it's still useful to set this parameter to a non-zero
value, so I think I'll probably leave it at the default.
Angus
On 2020-01-02 13:18, Andrew Swartz wrote:
Are you using Spamdyke? If so, depending upon configuration, it does
several DNS queries prior to passing the connection to qmail-smtpd.
On mine, it does reverse DNS lookup, checks several DNS blacklists,
etc. That could easily account for the delayed smtp response.
You could test this by temporarily deactivating Spamdyke and seeing if
that speeds it up.
-Andy
On 12/31/2019 4:41 AM, Angus McIntyre wrote:
Hmm.
MXToolbox reports that it takes 6 seconds for my server to respond to
SMTP connections.
spamdyke's 'greeting-delay-secs' is set to 6 seconds.
Well, there's a coincidence. ;-)
Thanks, Eric -- should have thought of that.
Anyone have any intuitions about how effective greeting-delay is as an
anti-spam tactic, and whether it has any impact on real mail?
Angus
On 2019-12-31 04:57, Eric Broch wrote:
If you have spamdyke installed it may have a timer
(greeting-delay-secs=) to inhibit spammers.
On 12/31/2019 2:54 AM, Angus McIntyre wrote:
I'm testing a newly-built mail server, and the tool at:
https://mxtoolbox.com/SuperTool.aspx
reports very slow connection and transaction times (approx. 6
seconds and 8 seconds respectively). The server is on a reasonably
powerful and very lightly-loaded VM.
Are these times typical? (I notice that my existing server is
similarly slow). Does qmailtoaster tarpit incoming connections as an
anti-spam measure? Or does this indicate a possible problem
somewhere that I ought to fix?
Thanks,
Angus
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