Here are a few options for the description of the WordPress post tag “郵遞” in Traditional Chinese, ranging in style and length:

**Option 1: Short & Descriptive**

* **Description:** 寄送物品、文件、訊息的官方途徑，包括信件、包裹等的派送服務。 (The official means of sending items, documents, and messages, including delivery services like letters and parcels.)

**Option 2: Slightly More Detailed**

* **Description:** 涵蓋所有與邮递相关的文章，包括郵件、包裹、快遞等遞送方式，以及郵局、郵資、郵務管理等相關資訊。 (Encompasses all articles related to postal services, including postal mail, parcels, express delivery, and related information such as post offices, postage, and postal management.)

**Option 3: Focusing on the Action**

* **Description:** 分享關於郵遞、寄送、派送的資訊與技巧。了解如何正確寄送郵件、追蹤包裹，以及了解相關的郵務規定。(Sharing information and tips about postal services, mailing, and delivery. Learn how to correctly send mail, track parcels, and understand relevant postal regulations.)

**Option 4: More Broad (if relevant to the blog’s content)**

* **Description:** 關注郵遞行業的發展、郵件遞送的最新趨勢、以及與此相關的政策與技術。 (Focused on the developments in the postal industry, the latest trends in mail delivery, and related policies and technologies.)

**How to choose the best description:**

* **Consider your blog’s focus:** What kind of content do you typically write related to “郵遞”?
* **Keep it concise:** WordPress tag descriptions shouldn’t be too long.
* **Use relevant keywords:** Include words that people might search for. In this case, terms like “郵件,” “包裹,” “郵局,” etc.
* **Be informative:** Give readers a good idea of what to expect within the tagged posts.

I recommend **Option 2** or **Option 3** as being a good balance of informative and concise. You can adjust them to better fit your specific blog content. Remember to save this in the tag’s description field in your WordPress dashboard when creating or editing the tag.