starttls-everywhere
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SNI not support :(
The check "babai.ru" show:
Failure: Name in cert doesn't match hostname: x509: certificate is valid for localhost, not mail.babai.ru
But new version openssl, testssl.sh, sslyze immuniweb test show valid thawte certificate:
https://www.immuniweb.com/ssl/?id=WxGZsI4I
I can confirm this, and it is especially an issue for servers hosting emails for several domains.
You need to enable SNI support by either setting smtp_tls_servername to hostname or add servername=hostname for the relevant hots in the tls_policy map file.