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A bit of SMTP protocol profiling...
I wanted to know how various protocol things actually get used
in real world networks. That is one of the reasons I have been
implementing various accounting things in ZMailer modules.
Samples have been picked from a system running 2.50 days during
Incoming SMTP shows:
SS.IncomingClientPipelines 2201 in 15% of connects
SS.SMTP_HELO 10874 in 73% of connects
SS.SMTP_EHLO 3960 in 26% of connects
+ 1% unknown ?
SS.SMTP_DATA 4339 oddly DATA and BDAT counts
SS.SMTP_DATA_ok 3883 don't come even close to MAIL
SS.SMTP_DATA_bad 456 command counts...
SS.SMTP_BDAT 121 A bit under 3% of sessions
SS.SMTP_BDAT_ok 100 do use CHUNKING (BDAT) ..
SS.SMTP_BDAT-kB 883 a bit under 3% in volume, too..
SS.ReceivedMessages 4460 = DATA + BDAT - before filters
SS.TransmittedMessages 3983 Accepted msgs into routing
SS.TransmittedRecipients 4012 .. and their recipients
Possibly MAIL From and RCPT To counts are excessively high
(compared with DATA+BDAT counts) because people have back-probes
of sender address validity, or some such.
Outgoing SMTP shows:
(this set of counters has its names altered a bit latter..)
TA.OutgoingSmtpConnects 1758826 Successfull connects
TA.OutgoingSmtpPIPELINING 1309250 About 74% reports PIPELINING,
which gets used...
TA.OutgoingSmtpEHLOok 1701568 About 97% respond successfully
on EHLO greeting !
TA.OutgoingSmtpEHLOfail 54028 And 3% fail..
TA.OutgoingSmtpHELO 54018 .. which falls back to HELO
TA.OutgoingSmtpHELOok 53973 .. and mostly succeeds.
TA.OutgoingSmtpMAIL 2787133 Of MAIL transactions
TA.OutgoingSmtpBDAT 46178 under 2% have CHUNKING (BDAT)
capability published at all!
TA.OutgoingSmtpDATA 2738630 some 98% use DATA,
Hmm... There are a few more minor protocol details that could
be counted -- what things get used, and what are available..
(SIZE, DSN, STARTTLS, AUTH, etc..)
/Matti Aarnio <email@example.com>
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