Heiko Schlittermann <hs@???> (Fr 06 Sep 2019 12:20:39 CEST):
> Mitigation
> ==========
>
> Do not offer TLS for incomming connections (tls_advertise_hosts).
> This mitigation is *not* recommended!
This should block the most popular attack vector:
In your MAIL ACL:
deny condition = ${if eq{\\}{${substr{-1}{1}{$tls_in_sni}}}}
message = sorry
Best regards from Dresden/Germany
Viele Grüße aus Dresden
Heiko Schlittermann
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