Film, Media & TV1 min ago
Letter M
3 Answers
On post (Letterbox type) what does the letter M stand for in the top right hand corner?
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It shows that the Mailsort service has been used.
For bulk mailing of items such as catalogues, senders get a discount if they pre-sort the mail.
There's a load of tedious detail here, with samples of the franking right at the end
http://www.satorisoftware.com/UK/support/documents/Resources /Pricing_Invoicing_and_Payment.pdf