postfix/sendmail: fatal: usage: sendmail [options]

[joshenry]

Hey, I'm getting this error after upgrading. Anyone have an idea on what it is and how to fix it?

postfix/sendmail[8218]: fatal: usage: sendmail [options]


Thanks.

PS - I noticed that in the New Message window the "Sender" drop-down box at the top of the message is empty and I can't select anything in there because there are no choices. Might have something to do with it?