Aaron, Gary,

| 1. internal user x sends mail to external user y. 
| 2. since we are sending mail to user y, user y must be ok to receive 
| mail from.
| 3. amavis or SA sees that we are sending mail "to" person y and 
| automatically adds user y to whitelist, either per recipient or global, 
| for future incoming emails "from" user y.

> I understood him to mean that when a message is sent to an external
> domain from inside a local domain, the recipient's name(s) would be
> captured and placed into an amavisd-new whitelist. This could probably
> be done by scripting a program to scan mail logs, collect the data,
> and place it into a table, either static or dynamic. I have a feeling
> however that once this was implemented, undesirable email addresses
> would end up in the database. Once that started happening, the idea
> would end up getting scrapped, but that is complete conjecture on my
> part. If done correctly I could see the value of this (at least
> conceptually).

I see, I misunderstood. Opening up a reverse channel indeed sounds
like a good idea, if done for a limited time and if opened just for the
sender/recipient pair, and contributing just a couple of negative score points
(not hard-whitelisting) to the final spam score.

SQL-based soft-whitelisting mechanism could probably be used for the job.
It is up to some external mechanism to add sender/recipient pairs to a 
soft-whitelisting database, and to expire them after a couple of days,
preferably slowly reducing negative score towards zero in few steps
or taking elapsed time in score calculation. Information about outgoing 
sender/recip pairs could be collected from reporting/logging SQL database,
it is not necessary to parse the log file. Contributions welcome.

  Mark

  Mark


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