[CentOS] Sendmail SMTP Brute-Force Attack
John R Pierce
pierce at hogranch.com
Thu Jun 14 23:49:31 UTC 2012
On 06/14/12 4:33 PM, Gustavo Lacoste wrote:
> I need help for STOP this spamers right now.
>
> Thanks in advance to anyone who can guide me
2 of the three relay IPs listed in your log fragment are listed on
spamhaus' Zen combined list, http://www.spamhaus.org/zen/
this is free for use by low volume non-commercial email servers. see the
terms linked on the above URL.
adding the following line to your sendmail.mc file, then rebuilding the
.cf and restarting sendmail would reject all mail connections from
servers listed via Spamhaus.
FEATURE(dnsbl,`zen.spamhaus.org',`Message from $&{client_addr} rejected
- see http://www.spamhaus.org/SBL/sbl-rationale.html') dnl
(note this file is in M4 syntax, and has to use 'funny' quoting, with a
` as the opening quote).
--
john r pierce N 37, W 122
santa cruz ca mid-left coast
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