User Agent: Mozilla/5.0 (Windows NT 6.1; WOW64; rv:30.0) Gecko/20100101 Firefox/30.0 (Beta/Release) Build ID: 20140605174243 Steps to reproduce: i have a Tunderbird with multiple accounts. I receive a mail on the account aa@xxx.com, I want to FORWARD the mail to an other address ... Thunderbird does NOT use the aa@xx.com account as sender to forward the mail. Actual results: Tunderbird uses an other account to forward the mail Expected results: Thunderbird must use the account where it receives the mail as reply address when I forward a mail. Thunderbird can not use an other mail account as "sender" . I receive an mail on aaa@xxx.com and if I forward the mail Thunderbird must use as sender and reply address aaa@xxx.com and NOT bbb@xxx.com Please review the complete procedure "forward-or transfer-mails" This is a bug since very longtimes ... please stup this kind of stupid errors!