Block Me plugin
This plugin allows you to configure an address which mail sent to will be
parsed for a From: address in the body of the message, and will add that
from address to the
mail_from.blocklist config file.
Effectively this allows your users to forward spams that got through to a particular mailbox to block them in the future.
Note that this is a system-wide block, and not per-user. Be careful with this.
config/block_me.recipient- a file containing the address to email to get something blocked. For example: firstname.lastname@example.org.
config/block_me.senders- a file containing a list of email addresses that are allowed to email the dropbox.