Benedict.

> I have created a mysql database based on cutting and pasting bits out of
> README.sql.txt which creates 4 tables, mailaddr, policy, users and wblist.

Ok.

> Am I right in thinking that if I set a policy up in the policy table, then
> set up a user in the users table, then I can modify the behaviour of
> amavisd new on a per user basis by having a policy for each user?

Yes.

> Or on a per domain basis by having a policy per domain?

Yes.

If multiple users (or domains) would have the same settings,
there is no need to give them individual copies of policy entries,
but you certainly may.

> Can I also assume that because a user is listed in users that amavisd-new
> treats them as local

Yes.

If you want otherwise, you may add a field 'local' (values Y or N) and
you may have this setting explicit. There is usually no need for it
though, the default suffices.

> and will clean mail for them?

Spam checking (and other checks) are performed regardless of
whether recipient is considered local or not.

> Will it mark spam for them if it is outbound?

X-Spam* header fields are only inserted for local recipients (inbound
and all-internal mail).

X-Virus-Scanned header fields are always inserted (as long as
virus scanning was done), regardless of recipient being local or not.

Again: spam checks are performed regardless or recipient being local,
so quarantining, bounces etc applies to outbound mail as well,
unless configured otherwise (bypass_*).

> (Or do i control that with ip based relaying?)

Client's IP address can be use to switch policy banks
(not to be confused with SQL table 'policy' - an unfortunate
similarity in names).
It gives you a choice to treat mail from 'mynetworks' (or other criteria)
differently, e.g. to be less restrictive on banned names and perhaps
allow higher spam score or turn off some checks entirely.

> Can I also ask what amavisd new will do with the contents of mailaddr and
> wblist?

wblist establishes a relationship between sender address (mailaddr)
and recipient address (table users).  A recipient (individual or domain)
can treat a sender (individual or domain) as blacklisted or as whitelisted,
or (better choice) give it few score points (positive or negative), which is 
called 'soft-black(white)listing'.

  Mark


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