If I make a message and store it as waiting and I open it as that and then change the account for which to send the message, then the connection still is made to the old account. Though PowerMail got an error from the old mail address (disabled), the message was labeled as sent succesfully. Of course that was not reassuring as I couldn't be sure of what was happening. I'll have to check next time, whether it actually tried to connect to both the old account and the new.
Before I investigate this deeper in order to supply CTM with quality info, please let me know if this is a known bug or if it is news to you guys. I know I can use the comments page for actual reporting, but that is of little use if this is a well known problem. PM 4.2.1 | OS X 10.2.6 | Powerbook G3/266 | 128 MB RAM | 20 GB HD