The term “airmail” refers to a mail item with postage paid based on the airmail rate and transported via airplane.

The term “prompt delivery mail” refers to a mail item that is delivered within a time limit with the payment of an extra charge.

When prompt delivery mail is delivered to a post office box or bag leased to the addressee, the date and time of delivery shall be the date and time it is dropped into the post office box or bag.

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An international unregistered mail which enjoys preferential handling by the postal services of the destination country and is given to a special courier to deliver as soon as possible and of which the online tracking information is provided, belongs to trackable mails..

“Express mail” refers to mail items sent between designated domestic areas or with the agreement of a foreign postal administration between the R.O.C. and designated post office branches in the said nation, or with the private sector companies providing EMS service in the country of destination so as to be delivered to the addressee as fast as possible and within an agreed-upon time limit..

“Registered mail” refers to a mail that bears an expression that means “Registered Mail” on the cover which is submitted to a post office branch or a person appointed by Chunghwa Post for delivery, for which the sender receives number registration certificate and proof of mailing and pays the fee for a registered mail. Mails including parcels, express mails and collect-on-delivery mails also belong to registered mails.
At the time of posting an item of registered mail, the sender may pay a fee (designated in rate charts) to receive an acknowledgement-of-receipt. This acknowledgement-of-receipt is filled out by the sender with the form supplied by the post office at the time of mailing and later returned to the sender after having been signed by the recipient.
If the delivery post office confirms clearly in writing that it has delivered the item, then that shall be deemed as the equivalent of having been signed by the recipient.

For an international registered letter-post item, the sender may request to restrict the delivery to the addressee in person.
Apart from paying a restricted delivery fee, the cover of the mail should bear an expression, either in French or English (which are both commonly used for international mail), that means “to the addressee only” on the cover of the mail item.

The term “value-declared mail refers to a registered mail sent within the nation of which the value has been declared with an extra value-declared fee having been paid by the sender.
The term “insured mail,” refers to a registered mail that has been declared and insured with an extra insurance fee having been paid by the sender.

The declared value of a value-declared mail or the insured amount of an insured mail may not exceed the actual value of the documents or materials contained in the item of mail.
If the declared value or the insured amount as mentioned above exceeds the actual value of the documents or materials that are the contents of the mail, claims may not be initiated if there is any damage or loss of the mail.

The term “collect-on-delivery (COD)” refers to a service that allows the postal service to collect payment for merchandise from its recipient at the time of delivery for an extra COD fee. This service is only available for value-declared or insured mails sent by senders who pay the fee for the collection of cash on delivery in accordance with the specifications publicly announced by Chunghwa Post.

The term “business reply mail” refers to stamp-less envelopes, postcards and questionnaires sent out in direct mailings by the addressee, as well as reply cards or stickers printed in newspapers or magazines, for which a postage and handling fee is collected from the addressee based on the number of such items mailed.

“Legal attest letter” refers to a letter written out in a format determined by Chunghwa Post with an identical copy left with the post office as proof, which is registered and for which an extra legal attest letter fee is paid by the sender at the time of mailing.
The copy filed at the post office should be kept for three years from the date of mailing and then destroyed.