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-   -   Slow POP3 with Dovecot and/or Courier (http://www.howtoforge.com/forums/showthread.php?t=6685)

makedo 6th September 2006 10:17

Slow POP3 with Dovecot and/or Courier
 
Hi everyone,

I've got a problem with POP3 access on my server. The access to the mails is rather slow. I am using Outlook XP on Windows for retrieving the mails, and it seems to "pause" slightly after each email. All emails are downloaded fine, and there are no timeouts, however it takes up a lot of time.

I have tried both Dovecot and Courier on the server. This is an issue with TLS or without TLS. I am authenticating against plain UNIX users (basically changed nothing in the configuration scripts, except the TLS cert). This is on a relatively unchanged Suse 9.3 system.

No error or warning messages in the log.

I am really at a loss here - what could possibly cause this problem? The server should be a lot faster than this (3 GHz, plenty of RAM, fast Internet connection).

My previous server was less capable and worked fine, also with Outlook, same setup (also with courier, but on Debian). I just can't seem to find the relevant difference...

Any ideas? Thanks a lot!

falko 7th September 2006 18:37

Sounds like a firewall problem. What's the output of
Code:

iptables -L
? Might also be a problem with your desktop firewall, if you use one.

makedo 7th September 2006 18:49

Thanks for your answer!

iptables is set to accept anything:

---
Chain INPUT (policy ACCEPT)
target prot opt source destination

Chain FORWARD (policy ACCEPT)
target prot opt source destination

Chain OUTPUT (policy ACCEPT)
target prot opt source destination
---

I also do not have a desktop firewall.

I tried using Thunderbird for a change, with the same result. I have also verified that the CLIENT seems to pause after each email, i.e. before sending the next "RCPT x" command to the POP server. (some 0.3 seconds to 1 second delay).

I still have NO idea what's causing this...

falko 8th September 2006 19:08

Do you see any errors in your log files?

makedo 8th September 2006 22:16

No related errors in any of the mail log files (in fact, no errors at all for pop3). /var/log/mail logs a typical session like this:

Sep 7 11:20:20 servername pop3d: Connection, ip=[::ffff:xx.xx.xx.xx]
Sep 7 11:20:20 servername pop3d: LOGIN, user=makedo, ip=[::ffff:xx.xx.xx.xx]
Sep 7 11:20:24 servername pop3d: LOGOUT, user=makedo, ip=[::ffff:xx.xx.xx.xx], top=0, retr=10128, time=4

Hm... any other ideas? :(

falko 9th September 2006 15:07

Quote:

Originally Posted by makedo
Sep 7 11:20:20 servername pop3d: Connection, ip=[::ffff:xx.xx.xx.xx]
Sep 7 11:20:20 servername pop3d: LOGIN, user=makedo, ip=[::ffff:xx.xx.xx.xx]
Sep 7 11:20:24 servername pop3d: LOGOUT, user=makedo, ip=[::ffff:xx.xx.xx.xx], top=0, retr=10128, time=4

Hm... any other ideas? :(

Didn't you say you are using Courier? Your logs show another POP3 daemon. What's the output of
Code:

netstat -tap
?

makedo 9th September 2006 15:35

Netstat coming up...:

Code:

Active Internet connections (servers and established)
Proto Recv-Q Send-Q Local Address          Foreign Address        State      PID/Program name
tcp        0      0 *:pop3                  *:*                    LISTEN      12369/couriertcpd

The courier package is from Suse 9.3. Started with /etc/init.d/courier-pop3.

falko 10th September 2006 19:37

Ok, it's Courier then.
What's the output of
Code:

ps aux
? What's the output of
Code:

updatedb
locate courier

?

makedo 11th September 2006 15:03

ps aux:
Code:

USER      PID %CPU %MEM    VSZ  RSS TTY      STAT START  TIME COMMAND
root    26128  0.0  0.0  1380  464 ?        S    Sep05  0:00 /usr/sbin/courierlogger -pid=/var/run/authdaemon.courier-imap/pid -start /usr/lib/courier-imap/authlib/authdaemond.plain
root    26129  0.0  0.0  1728  508 ?        S    Sep05  0:00 /usr/lib/courier-imap/authlib/authdaemond.plain
root    26130  0.0  0.0  1924  728 ?        S    Sep05  0:00 /usr/lib/courier-imap/authlib/authdaemond.plain
root    26131  0.0  0.0  1924  728 ?        S    Sep05  0:00 /usr/lib/courier-imap/authlib/authdaemond.plain
root    26141  0.0  0.0  1924  728 ?        S    Sep05  0:00 /usr/lib/courier-imap/authlib/authdaemond.plain
root    26142  0.0  0.0  1924  728 ?        S    Sep05  0:00 /usr/lib/courier-imap/authlib/authdaemond.plain
root    26177  0.0  0.0  1924  728 ?        S    Sep05  0:00 /usr/lib/courier-imap/authlib/authdaemond.plain
root    23718  0.0  0.0  1480  520 ?        S    14:57  0:00 /usr/lib/courier-imap/couriertcpd -address=0 -stderrlogger=/usr/sbin/courierlogger -stderrloggername=pop3d -maxprocs=40 -maxperip=4 -pid=/var/run/pop3d.pid -nodnslookup -noidentlookup 110 /usr/sbin/pop3login /usr/lib/courier-imap/authlib/authdaemon /usr/sbin/pop3d Maildir
root    23720  0.0  0.0  1252  296 ?        S    14:57  0:00 /usr/sbin/courierlogger pop3d

locate courier

Code:

/etc/courier
/etc/courier/authdaemonrc
/etc/courier/authdaemonrc.dist
/etc/courier/imapd
/etc/courier/imapd-ssl
/etc/courier/imapd-ssl.dist
/etc/courier/imapd.cnf
/etc/courier/imapd.dist
/etc/courier/pop3d
/etc/courier/pop3d-ssl
/etc/courier/pop3d-ssl.dist
/etc/courier/pop3d.cnf
/etc/courier/pop3d.dist
/etc/courier/quotawarnmsg.example
/etc/init.d/courier-authdaemon
/etc/init.d/courier-imap
/etc/init.d/courier-imap-ssl
/etc/init.d/courier-pop3
/etc/init.d/courier-pop3-ssl
/etc/init.d/rc3.d/K09courier-pop3-ssl
/etc/init.d/rc3.d/K10courier-authdaemon
/etc/init.d/rc3.d/S12courier-authdaemon
/etc/init.d/rc3.d/S13courier-pop3-ssl
/etc/init.d/rc5.d/K09courier-pop3-ssl
/etc/init.d/rc5.d/K10courier-authdaemon
/etc/init.d/rc5.d/S12courier-authdaemon
/etc/init.d/rc5.d/S13courier-pop3-ssl
/usr/lib/courier-imap
/usr/lib/courier-imap/authlib
/usr/lib/courier-imap/authlib/authdaemon
/usr/lib/courier-imap/authlib/authdaemond
/usr/lib/courier-imap/authlib/authdaemond.plain
/usr/lib/courier-imap/couriertcpd
/usr/lib/courier-imap/makedatprog
/usr/sbin/courierlogger
/usr/sbin/couriertls
/usr/sbin/rccourier-authdaemon
/usr/sbin/rccourier-imap
/usr/sbin/rccourier-imap-ssl
/usr/sbin/rccourier-pop3
/usr/sbin/rccourier-pop3-ssl
/usr/share/courier-imap
/usr/share/courier-imap/configlist
/usr/share/courier-imap/configlist.ldap
/usr/share/courier-imap/makeuserdb
/usr/share/courier-imap/mkimapdcert
/usr/share/courier-imap/mkpop3dcert
/usr/share/courier-imap/pop3d.pem
/usr/share/courier-imap/pw2userdb
/usr/share/courier-imap/sysconftool
/usr/share/courier-imap/userdb
/usr/share/courier-imap/vchkpw2userdb
/usr/share/doc/packages/courier-imap
/usr/share/doc/packages/courier-imap/AUTHORS
/usr/share/doc/packages/courier-imap/BUGS
/usr/share/doc/packages/courier-imap/COPYING
/usr/share/doc/packages/courier-imap/README
/usr/share/doc/packages/courier-imap/README.authdebug.html
/usr/share/doc/packages/courier-imap/README.authdebug.html.in
/usr/share/doc/packages/courier-imap/README.authmysql.html
/usr/share/doc/packages/courier-imap/README.authmysql.myownquery
/usr/share/doc/packages/courier-imap/README.authpostgres.html
/usr/share/doc/packages/courier-imap/README.imap
/usr/share/doc/packages/courier-imap/README.ldap
/usr/share/doc/packages/courier-imap/README.maildirquota
/usr/share/doc/packages/courier-imap/README.sharedfolders
/usr/share/man/man1/courierlogger.1.gz
/usr/share/man/man1/couriertcpd.1.gz
/usr/share/man/man8/courier-imapd.8.gz
/usr/share/munin/plugins/courier_
/usr/share/munin/plugins/courier_mta_mailqueue
/usr/share/munin/plugins/courier_mta_mailstats
/usr/share/munin/plugins/courier_mta_mailvolume
/var/adm/YaST/InstSrcManager/IS_CACHE_0x00000001/MEDIA/suse/i586/courier-imap-3.0.8-3.i586.rpm
/var/run/authdaemon.courier-imap
/var/run/authdaemon.courier-imap/pid
/var/run/authdaemon.courier-imap/pid.lock
/var/run/authdaemon.courier-imap/socket
/var/run/couriersslcache


falko 12th September 2006 16:13

Did you check the settings in the configuration files in /etc/courier?


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