I have a dream: one day the carriers are made responsible for all offences carried out over the telephone network or the internet, unless they can prove they have verified the identity of each user of their service, I know, it's never going to happen but it's nice to think it might.
You could always add your own 'junk' mail to bulk it up too, such as cereal boxes trimmed to size, used envelopes etcIf you fold any contents before restuffing the envelope, it makes it a large letter or small package which might attract a larger charge...
You could always add your own 'junk' mail to bulk it up too, such as cereal boxes trimmed to size, used envelopes etc