> This require some work from sender's side, how is using plain MUA<->ML > interaction. For things like Gmane or reportbug anti-spam rules are > customizable and known at least.
While defending against spam is being long enough on user's side [0], why not to apply this little addition to sender's duty, hm? [0] The poor user hit by spam in 5 hours after BTS post <[EMAIL PROTECTED]> ____ -- To UNSUBSCRIBE, email to [EMAIL PROTECTED] with a subject of "unsubscribe". Trouble? Contact [EMAIL PROTECTED]