User-Agent: Mozilla/5.0 (X11; U; Linux i686; fr; rv:220.127.116.11) Gecko/20060308 Firefox/18.104.22.168 Build Identifier: Thunderbird 22.214.171.124 Having the hability to apply filters on outgoing messages like incoming in order to, for example, move outgoing messages to a specific folder depending on criterias instead of 'sent'. For replied message having the possibility to put the sent message in the same folder as the original (replied) one. Reproducible: Always
I miss this feature too. Confirm on Seamonkey mail as well.
See also bug 180196. *** This bug has been marked as a duplicate of 11039 ***