Courier + Thunderbird, Kmail, pine

Courier + Thunderbird, Kmail, pine

Post by laurihytti » Wed, 02 Feb 2005 22:47:09


ello,

I've recently started some IMAP testing with Courier mail server and 3
email clients: Thunderbird, Kmail and pine. I've noticed some behaviour
while looking over tcpdump files of the connections. Questions are at
the end.

******************************************
With KMail
When I delete folders I see multiple connections which all end in
RESET. Each folder deletion is followed by a *BYE Disconnected due to
inactivity. After this a new connection is formed.

(taken from hexdump -C ): there is no great (a second or two) amount of
time between folder deletion and the bye message.

7 DELETE "INBOX.kmail4"
7 OK Folder deleted
* BYE Disconnected due to inactivity

(from tcptrace where I have deleted 3 folders)
TCP connection info:
1: 192.168.11.12:33114 - 192.168.10.7:143 (a2b) 29> 26<
(complete) (reset)
2: 192.168.11.12:33115 - 192.168.10.7:143 (c2d) 17> 15<
(complete) (reset)
3: 192.168.11.12:33116 - 192.168.10.7:143 (e2f) 17> 15<
(complete) (reset)
4: 192.168.11.12:33117 - 192.168.10.7:143 (g2h) 10> 9<
(complete)

Folder creation or selection does not start other connections.
****************************************
With pine
When I select folders in pine it seems to start a new connection for
each folder.
In this case I started pine and went thru 3 different folders.
(part of tcptrace output):

TCP connection info:
1: 192.168.11.12:33136 - 192.168.10.7:22 (a2b) 3> 3<
(complete)
2: 192.168.11.12:33137 - 192.168.10.7:143 (c2d) 16> 13<
(complete)
3: 192.168.11.12:33138 - 192.168.10.7:22 (e2f) 3> 3<
(complete)
4: 192.168.11.12:33139 - 192.168.10.7:143 (g2h) 14> 11<
(complete)
5: 192.168.11.12:33140 - 192.168.10.7:22 (i2j) 3> 3<
(complete)
6: 192.168.11.12:33141 - 192.168.10.7:143 (k2l) 14> 11<
(complete)
7: 192.168.11.12:33142 - 192.168.10.7:22 (m2n) 3> 3<
(complete)
8: 192.168.11.12:33143 - 192.168.10.7:143 (o2p) 12> 10<
(complete)

Folder deletion, renaming or creation does not start any additional
connections.
***************************************
With Thunderbird
Here any kind of folder command (select,delete,create,rename) has a
plethora of connections. All of them end in RESET.

sample tcptrace where I have selected 5 folders:

TCP connection info:
1: 192.168.11.12:33223 - 192.168.10.7:143 (a2b) 26> 20<
(complete) (reset)
2: 192.168.11.12:33224 - 192.168.10.7:143 (c2d) 18> 11<
(complete) (reset)
3: 192.168.11.12:33225 - 192.168.10.7:143 (e2f) 16> 11<
(complete) (reset)
4: 192.168.11.12:33226 - 192.168.10.7:143 (g2h) 16> 11<
(complete) (reset)
5: 192.168.11.12:33227 - 192.168.10.7:143 (i2j) 3> 3<
(complete)
6: 192.168.11.12:33228 - 192.168.10.7:143 (k2l) 3> 3<
(complete)
7: 192.168.11.12:33229 - 192.168.10.7:143 (m2n) 3> 3<
(complete)

Here with 10 folders (clicking the first the same five folders and then
starting anew)

TCP connection info:
1: 192.168.11.12:33232 - 192.168.10.7:143 (a2b) 28> 20<
(complete) (reset)
2: 192.168.11.12:33233 - 192.168.10.7:143 (c2d) 23> 15<
(complete) (reset)
3: 192.168.11.12:33234 - 192.168.10.7:143 (e2f) 22> 15<
(complete) (reset)
4: 192.168.11.12:33235 - 192.168.10.7:143 (g2h) 22> 15<
(complete) (reset)
5: 192.168.11.12:33236 - 192.168.10.7:143
 
 
 

Courier + Thunderbird, Kmail, pine

Post by Sam » Thu, 03 Feb 2005 09:04:39

This is a MIME GnuPG-signed message. If you see this text, it means that
your E-mail or Usenet software does not support MIME signed messages.

XXXX@XXXXX.COM writes:


What you're seeing is KMail closing the socket first. The "*BYE" is a
spurious message coming out a cleanup function. That message doesn't really
go anywhere, because the client torn down the socket already.


It probably is.


Neither. Most of what you're seeing are the after-effects of sloppy
programming and poor design, in those clients.



-----BEGIN PGP SIGNATURE-----
Version: GnuPG v1.2.4 (GNU/Linux)

iD8DBQBCABkXx9p3GYHlUOIRAlhhAJwKg6G+u7wvjCZO7k7MIjetkxmbMACfcBqE
rbvbKRMIaHGdd8zSZjHDNKQ=
=3kR/
-----END PGP SIGNATURE-----

 
 
 

Courier + Thunderbird, Kmail, pine

Post by laurihytti » Sat, 05 Feb 2005 09:52:36

Well I finally managed to nail my problem with Thunderbird. It seems
Courier by default only supported 4 concurrent connections and
Thunderbird wants more by default (5 I think). pine and KMail seem to
settle for less.

Thank you for the help.

Best regards,
Lauri Hyttinen