Wrong signature inserted by Mail by default

I have multiple email accounts. When I choose, Send New Mail Through Account "A", the signature for account A is always inserted. However, the account being used when I reply to incoming mail is the email address that received mail was addressed to. So I reply to mail in account B, the signature drop down says NONE, but my account "A" signature is already there. I have an email in composition that is to be sent using account B and has the sig for account A in there. I have to manually go into the signature drop down, choose the sig for account B (the only available choice aside from None), and the proper signature is inserted. I have different signatures for each account, by the way.
I presume that Mail should either insert the signature assigned to that account (fine by me) or insert no signature when it is reflecting NONE as the signature chosen in these replies. The current behavior has to be an error, in my view. Does this get reported to Apple Developers? I want to report this bug.

Thanks.

PowerBook5,2, BootROM 4.7.1f1, 1 processors, PowerPC G4 (1.1), 1 GHz, 768 MB Mac OS X (10.4.6)

PowerBook5,2, BootROM 4.7.1f1, 1 processors, PowerPC G4 (1.1), 1 GHz, 768 MB Mac OS X (10.4.4)