Phpmailer end of life 
Author: Donald M.Received this from my ISP today............ (I've removed the webspace username)
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Outdated script detected on: dmacd.co.uk (webspace xxxxxxxxxx)
This is a notification that the PHPMailer installation in /htdocs/mrm/res on hosting account xxxxxxxxx, is end of life (version 5.2.9).
End of life software is susceptible to vulnerabilities and bugs, which could result in your site being compromised.
Please ensure you obtain and install the latest updates from the software vendor as soon as possible.
Some of the scripts may be included as part of another software installation. Contact the vendor if you require further advice.
Should the installed software remain out of date we may have no option but to suspend your web hosting service.
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URL= www.dmacd.co.uk/mrm
Site was last updated and uploaded with V16.3.1 although it was originally created with V14 and exported/imported through V15 to V16.
Hello.Phpmailer has been updated in WebSite X5 2019.1.
Author
I've upgraded to V2019.1.7, and it looks like php has gone from V5.2.9 to V5.5. Does that sound correct?
My ISP is currently using php V7.1.4 - I hope it's backwards compatible.
Hi Donald.
I believe you're talking about two different things.
1_ PHP: it is essentially the coding language and engine that makes it so that many functionalities on your website work correctly. The emails are among these. At the moment, the best PHP version to have performance-wise is PHP 7.x, which is completely compatible with the v2019 version of the software. You can get this set up by your hosting's support
2_ PHP Mailer: this is the specific functionality that takes care of your emails. In order for it to work correctly, it needs a working version of PHP to be installed on your server. In v2019, it is updated to v5.5, which is compatible with PHP v5.6 or higher (like the 7.x)
If you have at least PHP 5.6 installed on your server (7.x would be better), then the version of PHP Mailer that the software is shipped with (5.5) will work flawlessly.
I hope I made the matter clearer for you
Thank you
Stefano