[Dovecot] Odd Feature Request - RBL blacklist lookup to prevent authentication

[Stan Hoeppner]

On 10/22/2013 10:27 PM, Robin wrote:
> On 10/22/2013 3:22 PM, Noel Butler wrote:
>> But I agree with you on the rest, since of those 500K IP's Marc claims
>> to have I'd bet that 99% are hijacked innocent pc's/servers, and of
>> them, >75% would likely be a one time usage.
> 
> This accords with our own statistics.  While it IS tempting to treat
> every IP# that "spams" or hits you with a port-scan as something worthy
> of blackholing, the reality is that the vast majority of the attempts
> are from "innocent" victim hosts.
> 
> Now, there's little doubt that MOST of these are not legitimate MTA
> endpoints, and so "shouldn't" be issuing email directly to your MX
> hosts.  SPF + OpenDKIM are great...

The OP is discussing possibly blocking *IMAP* connections, not SMTP.

-- 
Stan