Incompatible Plug-Ins Detected

Redsfan

macrumors regular
Original poster
Oct 26, 2012
145
4
Greater Toronto Area
I get this annoying error constantly in MacMail and it is related to an older version of Universal Mailer plug-in. I have to reboot mail and it's fine but the error comes back time and time again.

What exactly is this, and how can I get rid of it?

Cheers