A potentially useful feature comes to mind regarding blacklisting for
domains with lots of legitimate or non-blacklisted mail traffic:

 

Currently, ASSP can be configured to cache RBL hits for a user-configurable
amount of time.  This is great for those of us who receive large amounts of
spam traffic and takes a load off of the RBL providers.

 

It might be nice if ASSP could cache RBL "misses" for a different
user-configurable amount of time.  This would reduce the load on RBL
providers when multiple legitimate emails are received from the same IP
addresses/netblocks.

 

The downside of doing this - if ASSP receives an email from a spamming IP
that is not yet listed in the RBL, it will delay the blocking of mail from
that IP until the cache timeout is reached.  As a result I would suggest
making the timeout specification in minutes rather than hours.

 

Whitelisting might make this feature less of a benefit but it could
potentially still be quite useful for certain installations.

 

Regards,

 

- Phil

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