Wooden postcards sold in scenic areas can be sent abroad. Although its size is standard, its material doesn't meet postcard standard, as required by Article 13 of post office protocol, so the postage should be calculated as follows:
1. It should be sent as a letter if it is written with words, which makes it correspondence.
2. It should be sent as printed matter if there is no written word on it.
For international letter prices, please check:

For postage of airmail to different areas, please check :

Multiple pieces of printed matter sent abroad to the same recipient at the same address can be sent in a single special pouch weighing no less than 10 kg and no more than 25 kg (no more than 20 kg to UK, Kazakhstan and Uzbekistan). For registered mail, each pouch charges an additional NT$ 150 fee. However, the United States and Canada don't accept registered pouches.
For more info on prices of international printed matter pouch, please see:

Beginning on March 20, 1993, in response to customer demand, sending legal attest letters abroad was allowed. The procedure is the same as ordinary registered international mail. If the destination country doesn't provide return receipt service, then it shall not be sent as return receipt mail.
The post office is only responsible for verification of the date of sending and the content of the legal attest letter, and shall not be responsible whether domestic or foreign courts recognize its legal effectiveness. Also, no-return-receipt delivery or return receipt delayed (few countries provide return receipt service, and there are cases where return receipts are late for months). In conclusion, the post office doesn't guarantee the legal attest letter's legal effectiveness. Think twice before making such a delivery.

Optical discs can be mailed abroad, but they must not be pirated edition. In order to comply with government policy of protecting intellectual property rights, the post office will require the sender to show personal ID and write ID number on the receipt when mailing mail containing optical discs (including CD, VCD, DVD and CD-ROM, etc.).

For international mail, register mail include letter and parcel, the inquiries will be accepted within a period of six months from the day after that on which the item was posted.