1.1 Envelopes
Regarding envelope selection, envelopes with postal inspection marks on the back (which are not standard envelopes and are strictly prohibited from being mailed) are suitable. Generally, a #5 envelope is sufficient to hold a QSL card. The #5 envelopes sold on Taobao are both inexpensive and come in large quantities; similarly for international envelopes.
1.2 Postal code and address
Postal code lookup:https://dey.11185.cn/web/#/idtoolkitAddress; The postal code for international regular mail is written together with the address. The address can be pre-formatted in Word, and then printed using a printer, which means that the postal code can also be printed. Additionally, there are also label printers available.
Please fill in the address format as shown below.

Please fill in the recipient's phone number and the specific reason after the form.
1.3 Fees and Speed
Domestic standard mail within the city (this city) is 0.8 yuan for packages up to 20 grams, and 1.2 yuan for packages outside the city. International standard mail is divided into three categories: airmail, surface air lift, and surface/sea transport.(SURFACE)The above pricing and speed options are listed in descending order. Delivery speeds range from half a month to one year.
Fee inquiry: https://dey.11185.cn/web/#/jdpostage
In some countries, due to various reasons, land and water routes may not be available, and letters may be returned. When choosing a shipping method, it is necessary to print or label the address on the left lower corner of the envelope.

Due to the implementation of the "postcard" (postcard barcode) policy, the success rate of postcards has significantly improved compared to before. This is because the post office can now track the whereabouts of postcards in real-time. With a monitoring system in place, some regions treat postcards as registered mail. Therefore, if you include the recipient's phone number on the postcard, it is unlikely to be lost. Previously, most postcards were lost during delivery. Generally, postcards within China arrive within one week.

1.4 (thrown)
The easiest and most convenient way to send a letter is simply to drop it into the mailbox. Most mailboxes have infrared sensors, so when you put a letter in, the postal worker will receive a notification. The outside of the mailbox also indicates the opening time.
1.5 stamps
Discounted postage stamps are available on Taobao and other platforms, but some shops have a history of selling fake stamps. Before buying, search for the shop's name on Xiaohongshu to check their reputation. If fake stamps are detected, you will receive a refund, which would be embarrassing.🤣