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Using Bulk Mailer's Envelopes Against Them

Does this really work? The Office of Strategic Influence reports that you can use the bulk mailer return envelopes to mail back heavy boxes to snail mail spammers.

How can we test this?

Picture of Using Bulk Mailer's Envelopes Against Them
NachoMahma9 years ago
. Dunno. I did a little digging around at USPS, but didn't find anything one way or the other. We did this back in the '70s w/o repercussions, but the laws/enforcement could have changed since then.