Vigor,

> - no spam filtering - amavisBypassSpamChecks: TRUE

Not to forget also setting the amavisSpamLover: TRUE
is you want to ensure that any spam gets delivered to this recipient.
(multi-recipient mail or cached spam results makes a difference).

> - spam filtering with modified subject - amavisSpamModifiesSubj: TRUE,
> amavisSpamLover: TRUE

Ok.

> - discard spam - How to define it in ldap?

discard = not deliver & don't send a bounce (& perhaps not quarantine)

not deliver = set kill level as required, don't bypass spam check
  and don't make recipient a spam lover

don't send a bounce = set a amavisSpamDsnCutoffLevel to a value
  at or below kill level and keep $final_spam_destiny=D_BOUNCE
  as a global default

if you want, you may also turn off quarantining:
  amavisSpamQuarantineCutoffLevel can be set per-recipient,
  amavisSpamQuarantineTo can disable spam quarantine per-recipient
  regardless of spam level, or quarantining for spam disabled globally

> - deliver spam to spam folder - How to add '+' delimiter for particular
> user and not in global configuration?

With LDAP there are no per-recipient controls on that.
Address extensions are appended at tag level (which is per-recipient),
perhaps this helps in your case. If all recipients' mailboxes are
on a system which is aware of plus addressing scheme, it does not
hurt to attach '+spam' to every delivered spam - if a subfolder
or alias does not exist, delivery goes to a normal inbox.

> Maybe I can use policy_banks, let say I'll create a few policy_banks with
> different names, then will assign them per user in ldap?

policy banks are intended for by-client_IP or by_sender controls
(through mynets or TCP port chosen by MTA). They affect processing
at a message level, not per-recipient. When per-recipient lookups
are available, these should be used, not policy banks.

  Mark

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