Mail Classification
Providing high quality Mail and SDS Service is the primary objective of APS and Department of Posts.
Various types of mail services are available through  FPOs viz. Letter mail, Parcel mail, Registered post and Insured post.

Postal articles are classified into two broad categories as First Class Mails and Second Class Mails.

First Class Mails are given air transmission within India, wherever such air conveyance is available.  The delivery of First Class Mails is expedited thus, without collection of any extra charges from the public.

Second Class Mails are air-lifted, only if they are marked for air transmission on collection of the requisite air surcharges from the sender.
First Class Mail
Post cards, letters  and letter cards are treated as first class mail;
Postcards
Size
Postcard        14 cm. X 9 cm. 

Prohibitions
A Postcard cannot have anything attached to it.  It should not be folded, cut or otherwise altered except that the impressed postage stamp may be perforated with initials, nor should it be enclosed in cover of any kind. 
A single post-card has a stamp of the prescribed value impressed on it. A reply postcard has a stamp of the prescribed value impressed on each card. One part of the reply postcard is intended to contain the sender's communication.
"Folded paper type", post-cards of private manufacture made by folding and, or pasting together two or more layers of paper cannot be transmitted by post as a post-card. 
Letters
Letters may be transmitted by post with or without pre-payment of postage. A letter should not weigh more than 2 Kg. It should also conform to the limits of size.
Letter Card
Letter Card means a sheet of paper of the kind ordinarily used for letter writing suitably folded and gummed. Letter Cards, closely resembling in size and shape of the aerogramme form used in the foreign service, are issued by the Post Office for the use of the public. Letter Card has a stamp of the prescribed value of postage impressed on it.
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