
Originally Posted by
Jeffey
1.38a
Not sure if this is the case with you but I just had this happen all of a sudden with no changes on my end.
Turns out a very minor PHP version upgrade to 5.2.13 was the culprit for me.
Fortunately I was able to simply upload the /includes/classes/class.phpmailer.php file from the newest ZenCart version 1.3.9 and things got working again.
I saw and read a lot of these in my searches but this one was the most recent with no solution so here it lies. Lots of other potential causes and solutions so do some reading too.
Hope it helps someone.