rejecting botnets with sendmail

Ugo Bellavance ugob at
Thu Nov 2 15:30:39 GMT 2006

Denis Beauchemin wrote:
> Scott Silva a écrit :


>> You can add whitelisted entries in the access file if you use
>> feature_delay_checks in sendmail.
>> Has a lot of good sendmail stuff.
>> Are you using the new stuff in sendmail like greetpause, conncontrol, and
>> ratecontrol?
> Yes, I am using greetpause, conncontrol, and ratecontrol but they're not 
> enough.
> I knew about but not the rest of the 
> site.  It's quite interesting.  However I'm not sure how to whitelist a 
> remote site that appears on  The examples I saw 
> referred to email addresses...
> After some more reading on, I think I need the following in 
> my access file:
>   OK
> OK: "Accept mail even if other rules in the running ruleset would reject 
> it, for example, if the domain name is unresolvable. "Accept" does not 
> mean "relay", but at most acceptance for local recipients. That is, OK 
> allows less than RELAY."
> Denis

Here is what I use:

# Temporary measure - skip relay tests for this server

connect:**.110.223.185          OK
connect:**.110.235.244          OK

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