Hi Tate,
All of a sudden emails are not being received when sent through Listmail.
That's scary - when did this occur? I'm going to look at my configuration now, it seems problems with emails being sent too.... have to look...
NO, the PHP version can't be it, I'm running 4.3.4 have been for months, and it works fine.... the date shows as Jan 21, 2004, so there's probably newer versions of PHP out there, but I don't believe that's causing your problem... most likely a configuration issue?
Good luck, if you find anything let us all know