Apparently, it has taken almost a year for the most popular PHP mailing library to support TLS v1.1 and v1.2 !?
https://github.com/swiftmailer/swiftmailer/issues/933
(Packagist says it is downloaded almost 73 million times! https://packagist.org/packages/swiftmailer/swiftmailer)
… only after PHP geeks freaked out, started screaming, running like headless chickens (online), including me, maybe because some paranoid security guys turned off TLS v1.0 on their email servers?!
That is only one opensource community for you.
Once again it proves that popularity does not mean quality. 300+ open bugs of SwiftMailer look scary!
Popularity does not also mean good SLAs, the owners do NOT owe us anything.
We must be “grateful” for the object-oriented enterprisey mess they give us free.