Cyborg via Exim-users <exim-users@exim.org> (Mi 09 Jun 2021 21:13:43 CEST): > Don#t get me wrong, exim is at the top of this "best of the worse" list, > because it stops after 3 retriesm but other server like proftpd have already > reacted to this by implementing countermeasures. This can also be seen in > the mentioned figure.
The "3" is configurable: |smtp_max_synprot_errors|Use: main|Type: integer|Default: 3| So, if you worry about the abuse of your bandwidth and your Exim server, then set this to zero. Should be enough to not be a part of this attack vector, shouldn't it? Best regards from Dresden/Germany Viele Grüße aus Dresden Heiko Schlittermann -- 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 -
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