Heiko Schlittermann <[email protected]> (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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SCHLITTERMANN.de ---------------------------- internet & unix support -
Heiko Schlittermann, Dipl.-Ing. (TU) - {fon,fax}: +49.351.802998{1,3} -
gnupg encrypted messages are welcome --------------- key ID: F69376CE -
! key id 7CBF764A and 972EAC9F are revoked since 2015-01 ------------ -
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