Originally Posted by cflsystems
.....Maybe some with 5.3.5 or even with 5.4
As we currently understand it, it's straight from 5.2.* to 6.0.* with phpmailer so XC will have this requirement coming anyway soon...
Quite happy to change, upgrade and configure phpmailer ourselves, which will be the easiest option but see above re future core upgrades etc because then it will be classed as 'modified' every single time during the integrity check process