I can no longer send email with TLS security. PHPmailer 5.2.1 (January 2012) has many security bugs that have been fixed since, but now I can't properly send mail using 5.2.6 (April 2013, not provided by PHPMaker) as the current stable mailer. I haven't tried with SSL because our servers are TLS.
The list of issues fixed with 5.2.6 are too long to list, but the changelog says it all! Including RFC compliance and iCal support, proper line endings, language fixes etc. 5.2.6 is very stable in our other applications (non-PHPMaker). Please, this needs to be updated.