Domain Management

Sub-Domain Catch-All Rule Configuration

Path

Dashboard -> Domain Email -> Email Manage -> Sub-Domain

What is Sub-Domain Catch-All?

Before learning about sub-domain catch-all, you need to understand what a sub-domain is.

  • mail.com is a top-level domain, sub.mail.com is a second-level domain, and dev.sub.mail.com is a third-level domain. Both second-level and third-level domains are sub-domains of mail.com. Sub-domain catch-all is different from regular catch-all; it is domain-based catch-all.

Sub-Domain DNS Resolution?

Before using sub-domain catch-all, you need to configure sub-domain DNS resolution first. This resolution is different from receiving DNS resolution and must be configured separately.
Click the buttons in order: Sub-Domain receiving DNS configuration -> Change Regions -> Automatic DNS configuration -> Refresh DNS
The Automatic DNS configuration above can also be completed manually in your domain admin console.
Sub-domain DNS resolution requires using the wildcard *. Only full-featured DNS resolution platforms such as GoDaddy and Cloudflare support this. If the platform where you purchased your domain does not support it, please move the domain DNS resolution to a supported resolution platform, or configure DNS resolution separately for each sub-domain (use one sub-domain, add one sub-domain DNS record).

子域名收件解析

How to Enable Admin Email Catch-All?

Click the blue Catch all Sub-Email by Admin-Email button

代收规则配置

How to Customize Catch-All Rules

Click the green Create Rules button

代收规则配置
代收规则配置

View catch-all rules

代收规则配置
域名配置规则

Priority Issues

If the sub-domain being caught has already been added to GetMX independently, priority issues will occur. For example, sub-domain catch-all is enabled under mail.com, but sub.mail.com has also been added to GetMX. In theory, this situation should be avoided to prevent management confusion. If you must add it this way, the priority rules are as follows:

  • Receiving: The corresponding mailboxes under both domains will receive the email
  • Receiving quota: Uses the quota of sub.mail.com
  • Configuration: Uses the configuration information under the sub.mail.com domain, such as spam filtering, SPF, receiving rules, etc.

Catch-All Rule Conventions

Custom Characters

  1. {all}
    • Matches everything, such as: zhangyi2022, 138881909liu, 123456, zhangyi
  2. {number}
    • Matches numbers, such as: 2021, 13888888888, 1, 666
  3. {letter}
    • Matches letters, such as: zhangyi, weixin, test

Example

For example: set {all}@{all}.mail.com to be caught by [email protected]. Then countless mailboxes that match this rule, such as [email protected], [email protected], and [email protected], will all be caught by the [email protected] mailbox.

Check Catch-All

Click the yellow Check Alias button
Enter the receiving mailbox to query the matched rule and the mailbox being caught

Notes

  • The sub-domain catch-all feature is currently supported only on Professional and above plans
  • For cross-domain catch-all, please use Multi-Domain - Paid Group Click to view: Multi-Domain - Paid Group Catch-All Rules
  • When using {all}, it matches everything, so you cannot add {number} or {letter}
  • {letter} or {number} should preferably be used only once in a rule to avoid confusion and make management easier
  • Receiving troubleshooting does not currently support manual sub-domain catch-all. If you have receiving issues, please troubleshoot manually
  • If the added domain is already a sub-domain, sub-domain catch-all cannot be enabled. Only root domains support catch-all

Catch-all Rule Configuration

Receiving Rule Configuration