multiple IMAP sessions when connecting from one client
Hello,
I am using Postfix/Dovecot/IMAP.
Everything is working fine, but I have noticed that every time I connect with Thunderbird to my server via IMAP, not one but 4 connections are being logged into /var/log/mail/mail.log:
2014-08-27 09:17:46 dovecot: imap-login: Login: user=<martin>, method=PLAIN, rip=11.22.33.44, lip=55.66.77.88, mpid=12519, TLS, session=<uyb/N5cB+gBUDFRB> 2014-08-27 09:17:53 dovecot: imap-login: Login: user=<martin>, method=PLAIN, rip=11.22.33.44, lip=55.66.77.88, mpid=12521, TLS, session=<jioqN5cB/ABUDFRB> 2014-08-27 09:17:53 dovecot: imap-login: Login: user=<martin>, method=PLAIN, rip=11.22.33.44, lip=55.66.77.88, mpid=12523, TLS, session=<pqwwN5cB/QBUDFRB> 2014-08-27 09:17:54 dovecot: imap-login: Login: user=<martin>, method=PLAIN, rip=11.22.33.44, lip=55.66.77.88, mpid=12525, TLS, session=<cffremmc/gBUDFRB>
This looks like 4 separate sessions are created when I log in from one client.
Is this normal behavior? Can somebody please explain why this is so?
My Dovecot version is 2.1.7
regards, Martin
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On Wed, 27 Aug 2014, Martin Vegter wrote:
because Thunderbird wants to access 4 mailboxes simultaneously, e.g. to check or wait for new messages.
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On 8/27/2014 7:31 AM, lst_hoe02@kwsoft.de wrote:
BTW this is configurable in Thunderbird:
Tools->Account Settings->Server Settings->Advanced->Maximum number of server connections to cache
Default is 5 IIRC. I find the Tbird UI is much more responsive if set to 1, for "normal" IMAP use.
On -10.01.-28163 20:59, Martin Vegter wrote:
Note, however, that dovecot has various limits set and active by default, the most relevant for this matter probably being a mail_max_userip_connections of 10.
Regards, J. Bern
*NEU* - NEC IT-Infrastruktur-Produkte im <http://www.linworks-shop.de/>: Server--Storage--Virtualisierung--Management SW--Passion for Performance Jochen Bern, Systemingenieur --- LINworks GmbH <http://www.LINworks.de/> Postfach 100121, 64201 Darmstadt | Robert-Koch-Str. 9, 64331 Weiterstadt PGP (1024D/4096g) FP = D18B 41B1 16C0 11BA 7F8C DCF7 E1D5 FAF4 444E 1C27 Tel. +49 6151 9067-231, Zentr. -0, Fax -299 - Amtsg. Darmstadt HRB 85202 Unternehmenssitz Weiterstadt, Geschäftsführer Metin Dogan, Oliver Michel
participants (5)
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Jochen Bern
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lst_hoe02@kwsoft.de
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Martin Vegter
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Steffen Kaiser
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Tom Talpey