263 Enterprise Mail · Complete Setup Guide
263 Enterprise Mail is a long-established Chinese enterprise mailbox provider with many overseas server nodes — friendly for international email send/receive. Binding it to Laifaxin requires 2 steps:
| Step | Content | Required |
|---|---|---|
| 1. Enable the Client Authorization Code feature | Off by default; enable it manually in Account Security | Yes |
| 2. Create a new authorization code | Generate a dedicated code for Laifaxin | Yes |
→ When binding, fill the password field with the Client Authorization Code (not your 263 mail login password).
For security, 263 Enterprise Mail does not allow third-party client login by default. So setup splits into two parts:
- First, in the web UI under Account Security, enable the Client Authorization Code feature (one-time)
- Then create a specific code
→ Skip step 1 and the "Create" button won't appear.
1. Server Parameters
| Protocol | Use | Server | SSL Port |
|---|---|---|---|
| IMAP | Receive | imap.263.net | 993 |
| SMTP | Send | smtp.263.net | 465 |
Encryption: SSL / TLS
2. Get the Client Authorization Code
2.1 Open "Account Security" Settings
Log in to 263 Enterprise Mail web → click your avatar in the top-right → choose Settings from the dropdown → select Account Security on the left:
2.2 Enable the Client Authorization Code Feature
On the "Account Security" page, find Client Authorization Code — it defaults to "Off". Pick Enable from the dropdown:
A confirmation popup appears — click OK to enable:
2.3 Create the Code and Copy It
Once enabled, click the Add Authorization Code button:
Enter a purpose label for the code (we suggest Laifaxin) → click OK → the system generates the code → copy it immediately:
Once the window closes you cannot retrieve it — only delete and create a new one. Paste it into Laifaxin right away, or save to a password manager first.
3. Bind in Laifaxin
Go to Laifaxin email account and add the 263 enterprise mailbox:
| Field | What to enter |
|---|---|
| Email address | Full enterprise email, e.g. yourname@yourcompany.com |
| Password | Paste the Client Authorization Code (NOT the login password!) |
| IMAP server | imap.263.net · Port 993 · SSL |
| SMTP server | smtp.263.net · Port 465 · SSL |
Once verified, the mailbox status shows Normal — binding successful:
After binding, turn on mail sync + notifications (see Check New Emails).
Pitfall Summary
| Pitfall | Consequence | How to avoid |
|---|---|---|
| Can't find the "Add Authorization Code" button | Can't generate the code | Complete step 2.2 Enable first, then "Add" |
| Binding with the 263 login password | Authentication failed | Must use the Client Authorization Code, not the login password |
| Closed popup without copying | Code lost (shown only once) | Go to "Account Security", delete the old one, add a new one |
| Wrong server / port | Send/receive fails | IMAP imap.263.net:993 / SMTP smtp.263.net:465, SSL |
| Using enterprise mailbox for bulk sending | Company domain goes to spam, hurts the whole org | Use a quality channel for bulk; reserve the enterprise mailbox for 1-on-1 |
FAQ
Q1 · Why use a Client Authorization Code instead of the mailbox password?
This is a security enhancement:
- Doesn't expose your main login password to third-party apps, reducing leak risk
- You can revoke a single client's authorization anytime without affecting the main account or other apps
- Even if the code leaks, the attacker still can't log in to the web UI or change account settings
Q2 · Where do I enable the Client Authorization Code? Why can't I find it?
263's Client Authorization Code is off by default, and setup has two parts:
| Step | Where |
|---|---|
| 1. Enable the feature | Web UI → avatar → Settings → Account Security → Client Authorization Code → dropdown choose Enable |
| 2. Add a code | Once enabled, the Add Authorization Code button appears |
→ If you haven't enabled the feature, there's no "Add" entry — this is the most common rookie blocker.
Q3 · What if I forget / lose the code?
It cannot be recovered. Delete the old, create a new:
- Log in to the 263 web UI → Account Security → Client Authorization Code
- Delete the old code entry
- Click Add Authorization Code to generate a new one → re-bind in Laifaxin
Q4 · Do I need the admin to configure 263 Enterprise Mail?
Usually not. 263's Client Authorization Code is enabled and added by each user in their own web UI, no admin dependency.
→ As long as you can log in to your 263 web mailbox, you can complete the entire setup yourself.
Q5 · Is 263 Enterprise Mail suitable for foreign trade?
Among Chinese enterprise mailboxes, more recommended. 263 boasts many overseas server nodes, making international email send/receive more stable than typical Chinese mailboxes — a decent fit for foreign trade.
But bulk sending should still go through a quality channel — sending bulk directly from the enterprise mailbox damages the company domain reputation.
Q6 · How many emails can I send per day with 263? How to warm up?
The daily send limit varies by plan; don't run outreach at the cap:
| Stage | Daily send | Notes |
|---|---|---|
| Week 1 (newly bound) | Start at 50 | 5–10 min interval |
| Weeks 2–4 | 100–200 | Watch bounce rate (keep ≤ 3%) |
| Stable phase | Up to 300 | Bulk sends via quality channel |
Learning Suggestions
| Stage | Suggestion |
|---|---|
| Enable the feature first | "Account Security → Client Authorization Code → Enable" — the easiest step to miss |
| One client, one code + label it | Each client gets its own code with a clear name (e.g. Laifaxin / iPhone Mail) |
| Review periodically | Log in to the web UI regularly and delete codes no longer in use |
| Use Laifaxin features | After binding, explore Email Tracking / Templates / Smart Follow-up |
| Use a quality channel for bulk | For mass sends, don't send directly from the enterprise mailbox — use the quality channel |
Related Features
| Topic | Link | Description |
|---|---|---|
| Enterprise Mailbox Overview | 200-qiyeyouxiang-enterprise-mailbox | Quick reference for 7 major enterprise mailboxes |
| AliCloud Enterprise Mail | 203-aliyun-qiyeyouxiang-alibaba-cloud-enterprise-mailbox | Another Chinese enterprise mailbox setup |
| Email Account Setup | email-account | Binding flow + error code troubleshooting |
| Check New Emails | check-new-emails | Turn on sync after binding |
| Bulk Sending | email-mass-sending | Use a quality channel for mass sends |
Scroll to the bottom of this page and scan the support WeChat QR code (in the footer) for 1-on-1 help — real-time during business hours, replied first thing the next morning otherwise.
About 263 Enterprise Mail
What is 263 Enterprise Mail?
263 Enterprise Mail is the enterprise email service from 263 Network Communications, one of China's long-established enterprise mailbox providers. It focuses on stable, secure business email. Companies register with their own domain, and the admin assigns accounts to employees. Website: 263.net.
Highlights:
| Highlight | Description |
|---|---|
| Many overseas nodes | Numerous proprietary overseas server nodes, more stable for international mail |
| TAP smart anti-spam gateway | Self-developed, passed China's 863 Program A-level acceptance, AI + big-data spam filtering |
| Client Authorization Code | Third-party clients log in with a dedicated code, not exposing the main password |
Is 263 Enterprise Mail suitable for foreign trade?
Among Chinese enterprise mailboxes, more recommended for foreign trade:
- Many overseas nodes: More stable for international mail than typical Chinese mailboxes
- Strong anti-spam: TAP gateway filters accurately
- Overseas delivery rate still trails Google Workspace — for Europe/US focus, prioritize an overseas enterprise mailbox
Foreign trade selection guidance:
- Europe/US focus → prefer Google Workspace
- Mainly domestic office, secondary foreign trade → 263 is a solid Chinese option
263 Client Authorization Code Mechanism
263 uses the Client Authorization Code to isolate third-party clients from the main account:
| Dimension | Login password | Client Authorization Code |
|---|---|---|
| Purpose | Log in to the 263 web UI | For third-party clients (Laifaxin, etc.) |
| Default status | Active | Off by default, requires manual enabling |
| Leak risk | Main account compromised | Only that client affected, can be deleted individually |
| Quantity | 1 | Multiple (one code per client) |
→ Before setting up Laifaxin, be sure to enable the Client Authorization Code feature in "Account Security" first.
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