You did just update Zammad or possibly even your system?
Please ensure that your mail server does support the ciphers the operation system of your Zammad installation supports.
I updatet Zammad and system with no success.
When I update only Zammad it works, the system is Ubuntu 18.04.
So I suppose you did upgrade your OS.
In that case you’ll have to ensure that your mail server does support the Ciphers. This is technically not a Zammad issue but an issue with your mail server and OS.
When upgrading distributions (and sometimes openssl versions) sometimes ciphers are dropped for security reasons.
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