Re: [qmailtoaster] Slow connection and transaction times
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 - To unsubscribe, e-mail: qmailtoaster-list-unsubscr...@qmailtoaster.com For additional commands, e-mail: qmailtoaster-list-h...@qmailtoaster.com - To unsubscribe, e-mail: qmailtoaster-list-unsubscr...@qmailtoaster.com For additional commands, e-mail: qmailtoaster-list-h...@qmailtoaster.com - To unsubscribe, e-mail: qmailtoaster-list-unsubscr...@qmailtoaster.com For additional commands, e-mail: qmailtoaster-list-h...@qmailtoaster.com - To unsubscribe, e-mail: qmailtoaster-list-unsubscr...@qmailtoaster.com For additional commands, e-mail: qmailtoaster-list-h...@qmailtoaster.com - To unsubscribe, e-mail: qmailtoaster-list-unsubscr...@qmailtoaster.com For additional commands, e-mail: qmailtoaster-list-h...@qmailtoaster.com
Re: [qmailtoaster] Slow connection and transaction times
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 >>> >>> - >>> To unsubscribe, e-mail: qmailtoaster-list-unsubscr...@qmailtoaster.com >>> For additional commands, e-mail: >>> qmailtoaster-list-h...@qmailtoaster.com >>> >> >> - >> To unsubscribe, e-mail: qmailtoaster-list-unsubscr...@qmailtoaster.com >> For additional commands, e-mail: qmailtoaster-list-h...@qmailtoaster.com > > - > To unsubscribe, e-mail: qmailtoaster-list-unsubscr...@qmailtoaster.com > For additional commands, e-mail: qmailtoaster-list-h...@qmailtoaster.com > > - To unsubscribe, e-mail: qmailtoaster-list-unsubscr...@qmailtoaster.com For additional commands, e-mail: qmailtoaster-list-h...@qmailtoaster.com
Re: [qmailtoaster] Slow connection and transaction times
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 - To unsubscribe, e-mail: qmailtoaster-list-unsubscr...@qmailtoaster.com For additional commands, e-mail: qmailtoaster-list-h...@qmailtoaster.com - To unsubscribe, e-mail: qmailtoaster-list-unsubscr...@qmailtoaster.com For additional commands, e-mail: qmailtoaster-list-h...@qmailtoaster.com - To unsubscribe, e-mail: qmailtoaster-list-unsubscr...@qmailtoaster.com For additional commands, e-mail: qmailtoaster-list-h...@qmailtoaster.com
Re: [qmailtoaster] Slow connection and transaction times
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 - To unsubscribe, e-mail: qmailtoaster-list-unsubscr...@qmailtoaster.com For additional commands, e-mail: qmailtoaster-list-h...@qmailtoaster.com - To unsubscribe, e-mail: qmailtoaster-list-unsubscr...@qmailtoaster.com For additional commands, e-mail: qmailtoaster-list-h...@qmailtoaster.com
