Outlook or ThunderBird Not Connected SMTP 587 STARTTSL "No SECURE"

Please make sure port is open in firewall and /etc/exim.cert (key) are valid.
 
https://www.checktls.com/TestReceiver results;
Certificate 1 of 1 in chain: Cert VALIDATION ERROR(S): self signed certificate
So email is encrypted but the recipient domain is not verified
Cert Hostname DOES NOT VERIFY (xxx.com != mail.hostname.com)
So email is encrypted but the host is not verified
 
Your certificate does not include mail.domain.com, so, just use domain.com as the server in your mail settings, or generate a cert for mail.domain.com as well.
 
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