[MlMt] Does MailMate support TLS 1.3?

[Benny Kjær Nielsen]

On 20 Feb 2025, at 21:19, Sean McBride wrote:

> It seems to me that MailMate does not support TLS 1.3 when using IMAP?  Is that expected?

Yes, this is expected behavior. MailMate uses CFNetwork, an older Apple framework, which does not support TLS v1.3 and most likely never will. It appears that large parts of the framework was recently deprecated (with macOS 15).

You should still be fine with TLS 1.2 if you are careful with the configuration. I'm sure there's recommendations somewhere out there :)

Until recently I've had very few queries about TLS 1.3, but given that CFNetwork is not going to be updated I'll have to replace the connection-related code at some point. This means using the newer “Network” framework (horrible search-unfriendly naming). This framework is 10.14+ and MailMate is 10.12+. That's not a big problem, but in any case it might be best if I support both frameworks for some time -- just like MailMate did when it switched from openssl to CFNetwork...

(It's not a simple change and I don't have a time frame for you.)

-- 
Benny
https://freron.com/support