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feat(subdomain): add random second-level mailbox support (#924)

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Summary: add random second-level subdomain mailbox creation for web, admin, and
  Telegram.

Scope: worker config, UI toggle, and README/VitePress documentation.

Co-authored-by: wufei <fwu@creams.io>
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tsymr
2026-04-02 23:13:10 +08:00
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co-authored by wufei
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vitepress-docs/docs/en/guide/feature/subdomain.md
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@@ -9,3 +9,29 @@ Mail channel is no longer supported. The reference below is limited to the recei
Reference
- [Configure Subdomain Email](https://github.com/dreamhunter2333/cloudflare_temp_email/issues/164#issuecomment-2082612710)
## Create Random Second-level Subdomain Addresses
If your base domain mail routing is already configured, you can also let users create mailbox
addresses with an automatically generated random second-level subdomain, for example:
- Base domain: `abc.com`
- Created address: `name@x7k2p9q1.abc.com`
This is useful for mailbox isolation and reducing repeated hits on the same address.
Add these worker variables:
```toml
RANDOM_SUBDOMAIN_DOMAINS = ["abc.com"]
RANDOM_SUBDOMAIN_LENGTH = 8
```
- `RANDOM_SUBDOMAIN_DOMAINS`: base domains that allow optional random second-level subdomains
- `RANDOM_SUBDOMAIN_LENGTH`: random string length, range `1-63`, default `8`
> [!NOTE]
> This feature only appends a random second-level subdomain when the mailbox is created.
>
> It does not automatically create Cloudflare-side subdomain mail routes or DNS records for you,
> so make sure the base-domain/subdomain routing is already available first.