We don't have synonyms for freepost yet — it may be a rare, specialized, newly coined, or misspelled word. The closest thesaurus entries we have are freeboot, freeport and free port.
(n) :
(chiefly UK) A postal service allowing a person to send mail without affixing postage, the recipient paying when collecting the mail.
(n) :
(UK) A postal service allowing an electoral candidate, political party or government department to send mail wholly paid for by Royal Mail (as the statutory universal postal service provider).
(n) :
(chiefly UK) A postal service allowing a person to send mail without affixing postage, the recipient paying when collecting the mail.
(n) :
(UK) A postal service allowing an electoral candidate, political party or government department to send mail wholly paid for by Royal Mail (as the statutory universal postal service provider).