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On Wed, 22 Mar 2017, Steffen Kaiser wrote:
On Tue, 21 Mar 2017, Bappasaheb Nirmal wrote:
Dovecot log is showing too many POP3 RETR entries which are identical lines. I also suspect that it is causing high pop traffic eating most of the network bandwidth. Here are some of the lines out of 11009 in a day. Such pattern is observed only for few users. dovecot version is 2.1.17.
============== Mar 20 00:00:07 pi3 dovecot: pop3(user@example.com): Disconnected: Logged out top=0/0, retr=1/64014, del=0/1429, size=478762716 Mar 20 00:00:07 pi3 dovecot: pop3-login: Login: user=user@example.com, method=PLAIN, rip=43.243.173.97, lip=192.168.1.18, mpid=26645, secured, session=<5CGrmRlLyAAr861h> Mar 20 00:00:10 pi3 dovecot: pop3(user@example.com): Disconnected: Logged out top=0/0, retr=1/64014, del=0/1429, size=478762716 Mar 20 00:00:11 pi3 dovecot: pop3-login: Login: user=user@example.com, method=PLAIN, rip=43.243.173.97, lip=192.168.1.18, mpid=29932, secured, session=
What could be the possible reason?
stating the obvious: it looks like normal POP3 polling with abnormal short interval.
To verify the guess sniff the network traffic, if the clients open a connection in that short time. If so, check out the users devices, why the client is polling so often.
Oh, forgot to mention:
looks like that the client downloads the same message of 456MB each time again?
Steffen Kaiser -----BEGIN PGP SIGNATURE----- Version: GnuPG v1
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