Does all post cards must have stamps on them ?

Question

if theyre just not those post cards that has pictures on other side it ?

Answer 1

yes, they do

Answer 2

If you are mailing them, of course they require a stamp.

Answer 3

Post cards do not usually come with postage on them, you have to actually buy a stamp and affix it. As for the kind you buy while on vacation, they do not come with postage on them.

Answer 4

Yes, you must affix postage to all mail.

P.S.  This category, "Special Education," refers to the education of people with disabilities and related issues.   :)