On Thu, Mar 25, 2010 at 05:05:47PM +0530, Chaminda Indrajith wrote:
> I need to put the SPAM mails into users' Junk Mail folder. How
> can we do it in Postfix?
> 
> Mails are stored in Maildir format in the user's home directory.
> Junk mail folder is inside the Maildir as ".Junk". Amavisd-new
> tags the spam mails as "[SPAM]"

Amavisd-new can also use a recipient_delimiter and change the
localpart "user" to "user+spam". See amavisd-new documentation to
learn how to activate this feature.

Postfix local(8) can handle this differently by using a
~user/.forward+spam file.

Postfix virtual(8) can handle this differently by using a different
virtual_mailbox_maps result for user+s...@example.com .

References:
    http://www.postfix.org/postconf.5.html#recipient_delimiter
    http://www.postfix.org/local.8.html
    http://www.postfix.org/aliases.5.html
    http://www.postfix.org/virtual.8.html
    http://www.postfix.org/postconf.5.html#virtual_mailbox_maps
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