Actually, no, OpenSSL wasn't upgraded. I noticed that most traffic to our website is via mobile / cell phones over 3G and 4G networks I also noticed that most of the mobile clients support SPDY and HTTP 2.0 so I enabled SPDY and HTTP 2.0 support, and enjoyed a very nice speed up on mobile devices. This update was done after Postman was updated, but before the website sent it's next email. A connection wasn't made between that update because I thought that turning on HTTP 2.0 would not affect email. Once I switched it off, email began working again - which led to some testing and rebuilds to work out it was ALPN and NPN together that broke it, but NPN only is OK. Needless to say, ALPN is currently patched out.
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