Frequently Asked Question

The minimum supported Secure Protocol is now TLSv1.2

TLSv1.2 has existed since 2008, and was widely adopted in early "20 teens" and is supported in all modern Mail clients, please upgrade

History

Earlier SSL versions were found to be insecure and have been unsupported almost everywhere for many years, for example SSLv3 ended in 2014 whilst SSLv2 ended around 2010.

TLSv1 (aka TLSv1.0) was born in 1999, it was deprecated years ago, PCI DSS (Card Payment Systems) even ended compliance support back in early 2018.

TLSv1.1 born in 2006 was deprecated several years ago and is slated for removal from all browsers from January 2021

TLSv1.3 was released in 2018 and is currently the best support for privacy and supported in most modern browsers and devices.