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

twk twk at
Wed Oct 26 09:59:32 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)?


The way I solved this was by designating a specific folder to be my sent 
  folder (in my case "out"), adding the "anyone p" privelege to the 
folder, then replacing the "save a copy" action with a BCC with plus 
addressing to the "out" folder (twk+out at Then, a copy of the 
message is actually sent to the sent folder, which is not dependent on 
the copy action in Thunderbird.

I have used this for years and it works flawlessly

2 caveats :
- our sendmail rules normalize everything to lower case, so the folder 
name must be all lower case letters
- everything in the "out" folder appears as a unread message. I 
occasionally select all the messages and mark them as read.


Tom Karches                    email : twk at
Web/Email Systems Admin        phone : 919.515.5508
NCSU Information Technology

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