Recommendations for Thunderbird settings when it hangs copying to "sent folder"

Ken Murchison murch at
Wed Oct 26 09:55:50 EDT 2005

Klaus P. Pieper wrote:
> Hi,
> Cyrus 2.1.18 on Debian Sarge used mostly with Thunderbird 1.0.6 on 
> Windows XP. One NAT router and an additional router / switch between the 
> server and the TB clients.
> Occasionally (it appears that this happens usually after intensive use 
> of the search function) the TB client hangs after sending out a mail 
> with the message "copying to sent folder". It is not related to the size 
> of the message. The message *is* sent out but then we have to restart 
> the TB client. No chance to save the message in the IMAP sent folder.
> There are a few bug reports available on this but I haven't found a real 
> solution so far. Does anybody use the combination of TB and Cyrus 
> without problems? Could we use a sieve script to put a copy of each 
> outgoing mail into the sent folder (instead of having the client do this)?

This isn't a problem with Cyrus or TB, its a problem with your NAT 
router "closing" idle connections.  In TB under the advanced server 
settings, try changing the number of cached connections to 0 or 1, and 
disable the use of the IDLE command.

Kenneth Murchison
Systems Programmer
Carnegie Mellon University

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