[MlMt] editing the preferred sender address database?

[Steven M. Bellovin]

Somehow, a number of recipients I send to frequently have become 
associated with the wrong From: address.  Is there any way to edit the 
database?  Failing that, is there some single file I can truncate or 
delete?  It's gotten quite annoying, especially for mailing lists.  (I 
should add that I fear there's some bug in the default address selection 
algorithm, based on the addresses sometimes used, but I've never managed 
to catch MailMate in the act of doing it wrong for new addressees.)