Quote Originally Posted by Nick1973 View Post
No that doesn't exist and includes/classes/class.phpmailer.php is installed. This was a site developed from a clean install of Zen Cart 1.5.3

It wasn't an upgrade.
I don't mean to be argumentative, but I think you're mistaken.

When I download the official Zen Cart v1.5.3 release zip, I confirm that the class.phpmailer.php file does indeed contain the SetFrom function ... on line 710.
If yours doesn't, then you've somehow replaced it with a different one, or wherever you got the Zen Cart files from is giving you something different.

Open the file and copy the first 25 lines of that file to your clipboard, and paste them here in a reply.