Interesting, the trigger has been working fairly consistently for me for over a week, otherwise I wouldn't have posted it. But I don't have any Yahoo e-mail account provisioned; just two Gmail and four generic IMAP. For those of you still having trouble, how is your Yahoo mail account provisioned? Mail for Exchange? POP3? IMAP?

Re-creating the trigger would not have any affect, unless you first blow away your .qmf/ directory, which doesn't seem to be a permanent fix, either.