The PhpMailer team has released a new version due to a discovered vulnerability in their code. This affects a large percentage of websites, not just Zen Cart. The fix is easy. Just upload the new files to Zen Cart – this will overwrite a number of files for the mailer but probably not files anyone has actually edited before. There should be no integration concerns. 

The vulnerability would allow someone to use your zen cart installation to send emails without you knowing it until your hosting company shuts down your website for spamming!  So get it done!

Contact me for more information.