Any #PHP experts out there know if there's a way to get rid of multipart messages in these:

use Zend\Mail\Message;
use Zend\Mime\Message as MimeMessage;
use Zend\Mime\Part as MimePart;

I've got a customer issue the developers don't want to fix, so I'm taking a crack at it.

Full BSD 2-clause code at ftp://ftp.perforce.com/perforce/r18.2/bin.multiarch/swarm.tgz if you want context.

This is the Module.php file I'm looking at. I see where the message is built on line 403 but I can't figure out how to fix it.

Ultimately, the issue is in the fromName on line 415 (or possibly 417, but I think 415), but I can't figure out how that fromName is built.