# How do I use a catch-all address and aliases on my own domain? > A catch-all sends every unused name at your domain to one inbox. Proton Mail, Tuta, Mailbox.org and Fastmail document it. - URL: https://postelva.com/guides/catch-all-and-aliases/ - Last updated: 2026-11-12 - Publisher: Postelva (https://postelva.com) With your own domain you can hand out a different address to every website and read all of them in one mailbox. This guide shows how a catch-all and aliases work, and what each provider allows. **Quick answer — How do I use a catch-all address and aliases on my own domain?** A catch-all delivers every message sent to an unused name at your domain, such as shop@yourname.com, into one mailbox, while an alias is a named address you create on purpose. **Postelva** sells the domain; Proton Mail, Tuta, Mailbox.org and Fastmail each document a catch-all, and Mailbox.org Standard allows 50 aliases. ## Catch-all and alias limits by provider *Plan data read on the providers' own pages on 12 November 2026. "Not stated" means the page read gave no figure.* | Provider and plan | Catch-all | Addresses or aliases on a custom domain | Where to set it | | --- | --- | --- | --- | | Proton Mail Plus (1 custom domain) | Yes | 10 addresses | In the web app, from the domain settings | | Proton Unlimited (3 custom domains) | Yes | 15 extra addresses per the plan page; other sources say 15 in total (not verified) | In the web app, from the domain settings | | Tuta (Revolutionary, Legend) | Yes, one per custom domain | Plan table and page text disagree (not verified) | Global Settings > Custom email domains > catch-all | | Mailbox.org Standard | Yes, one account per domain | 50 aliases | An alias written as @yourname.com | | Mailbox.org Premium | Yes, one account per domain | 250 aliases | An alias written as @yourname.com | | Fastmail (Individual, Duo, Family) | Yes, wildcard alias | Many custom addresses | Settings > My email addresses | | Migadu (all plans) | Not stated | Unlimited mailboxes and aliases | Migadu admin panel | | iCloud+ | Not stated | Up to 10 addresses per domain, up to 5 domains | iCloud settings | | Zoho Mail Free | Not stated | Up to 5 users, 1 domain | Zoho admin console | ## What is the difference between an alias and a catch-all? **An alias is an address you create by name, and a catch-all is a rule that accepts every name you did not create.** Both land in a mailbox you already have. If you create the alias bank@yourname.com, only mail to that exact name arrives. If you switch on the catch-all, mail to anything@yourname.com arrives, including names you never thought of. The two work together. The mailbox keeps a short list of named aliases, and the catch-all picks up the rest. At Fastmail a specific alias wins over the catch-all, so a named address is never swallowed by the wildcard. This is only possible because the domain is yours. An address at a provider's own domain, such as @proton.me, @tuta.com or @mailbox.org, belongs to that provider: if you leave, you lose it. An address at your own domain moves with you, which is the point of a [custom email domain](https://postelva.com/custom-email-domain/ "What is a custom email domain?"). ## Which providers support a catch-all on a custom domain? **Four providers document a catch-all in the help pages Postelva read: Proton Mail, Tuta, Mailbox.org and Fastmail.** Zoho Mail, Migadu, iCloud+ and the other providers in the index may offer a similar feature, but the pages read on 12 November 2026 did not say so, and Postelva does not state it as a fact. According to Postelva's index of 12 November 2026, 4 of the 14 providers checked document a catch-all for custom domains, and all 4 limit it to paid plans. Nothing at a provider changes your domain: the domain is registered at Postelva, and the provider only receives the mail that your MX records send to it. ## How do I set up a catch-all at each provider? **The steps differ, but every provider asks for the domain to be verified and its MX records to be live first.** Finish the provider setup before you switch the catch-all on. ### How do I set a catch-all at Mailbox.org? **Create an alias whose local part is empty, written @yourname.com.** Only one account can hold the catch-all of a domain. If the catch-all attracts too much spam, Mailbox.org lets you block it. The domain itself comes first: see [how to set up Mailbox.org with your own domain](https://postelva.com/guides/mailbox-org-custom-domain-setup/ "How to set up Mailbox.org with your own domain"). ### How do I set a catch-all at Tuta? **Open Global Settings, then Custom email domains, use the three-dot menu of the domain and choose the catch-all mailbox.** The catch-all is set per custom domain and works on any paid plan that includes custom domains. ### How do I set a catch-all at Fastmail? **Add a wildcard alias under Settings > My email addresses.** Fastmail also supports plus addressing and subdomain addressing, where a tag goes in front of a subdomain, so you can sort mail without creating anything. Domain steps are in the [Fastmail custom domain guide](https://postelva.com/guides/fastmail-custom-domain-setup/ "How to set up Fastmail with a custom domain"). ### How do I set a catch-all at Proton Mail? **Proton Mail lists the catch-all among the features of paid plans with a custom domain.** Mail Plus covers 1 custom domain and 10 addresses; Proton Unlimited covers 3 domains. The domain setup, with its two MX records and three DKIM records, is in the [Proton Mail custom domain guide](https://postelva.com/guides/proton-mail-custom-domain-setup/ "How to set up Proton Mail with a custom domain"). ## Does plus addressing work on a custom domain? **Plus addressing sends name+word@yourname.com to the inbox of name@yourname.com, and support depends on the provider.** Proton Mail supports it with no setup. Fastmail supports plus addressing and also subdomain addressing. Tuta's support states that it does not support plus addressing on Tuta-owned domains. For a custom domain, no official page read on 12 November 2026 confirmed the behaviour at Proton or Tuta, so test it with one message before you rely on it. A catch-all gives the same result with a stronger property: a site cannot guess your real address by deleting the part after the plus sign, because the whole name is different. ## Is a catch-all a good idea? **A catch-all is useful for identifying who leaks your address and risky because it also receives guessed names.** The privacy argument is simple: one address per website means a spam source can be traced, and one breached address does not expose the other accounts. Fastmail published this argument as a way to see which companies sell your data. The cost is spam. Bots try common names at every domain, and the catch-all accepts them. A workable rule is to use the catch-all for registrations and newsletters, give real contacts a named alias, and switch the catch-all off or block it if the volume grows. The routing of every message still depends on the MX records, so if mail for a name does not arrive, read [why email is not arriving at a custom domain](https://postelva.com/guides/email-not-arriving-custom-domain/ "Why is email not arriving at my custom domain?"). ## Can I forward a name without a mailbox? **Yes: Postelva offers free email forwarding and URL forwarding from the client area.** Forwarding relays one name to an address you already read, which suits a domain that has no mailbox. Choose one route for each domain: the MX records decide where mail for the domain is delivered, so a domain that points its MX records at Proton Mail, Tuta or Mailbox.org uses the aliases of that provider instead. In short, Postelva is the place where you buy the domain and keep its DNS, and the mailbox provider is the place where the aliases live. Both pieces stay under your control. ## Catch-all and aliases: questions ### Does a catch-all work without a mailbox plan? No. A catch-all delivers into a mailbox, so it needs a provider plan that accepts your domain. If you only want to relay a name to an existing address, use the free forwarding in the client area. ### How many aliases can I create at Mailbox.org? Mailbox.org Standard allows 50 aliases for custom domains and Premium allows 250, on the prices page read on 12 November 2026. Only one account can hold the catch-all of a domain. ### Can two people share one catch-all? Not at Mailbox.org, where one account holds the catch-all of a domain. For a household, give each person a named address and keep the catch-all in one mailbox. ### Will the catch-all fill my inbox with spam? It can, because it accepts guessed names such as info@ or admin@. Mailbox.org lets you block the catch-all, and at Fastmail a named alias is delivered before the wildcard is applied. ### Do aliases change when I move to another provider? The addresses stay, but the alias list lives at the provider and must be recreated at the new one. Write the list down before you change the MX records. **In summary** - A catch-all delivers every unused name at your domain to one mailbox. - An alias is a named address; at Fastmail it wins over the catch-all. - Proton Mail, Tuta, Mailbox.org and Fastmail document a catch-all; 4 of 14 providers in the index. - Mailbox.org: 50 aliases (Standard), 250 (Premium), one catch-all account per domain. - Proton Mail Plus: 1 custom domain, 10 addresses; Proton Unlimited: 3 domains. - Plus addressing: Proton and Fastmail yes; Tuta no on its own domains. - Aliases live at the provider; the domain is yours and moves with you. ## Sources 1. [mailbox.org KB: catch-all alias with a custom domain](https://kb.mailbox.org/en/private/custom-domains/how-to-set-up-a-catch-all-alias-with-a-custom-domain-name) — mailbox.org (read 2026-11-12) 2. [mailbox.org prices](https://mailbox.org/en/prices) — mailbox.org (read 2026-11-12) 3. [Catchall / wildcard aliases](https://www.fastmail.help/hc/en-us/articles/1500000277942-Catchall-Wildcard-aliases) — Fastmail (read 2026-11-12) 4. [Plus addressing and subdomain addressing](https://www.fastmail.help/hc/en-us/articles/360060591053) — Fastmail (read 2026-11-12) 5. [Use unique email addresses to catch companies selling your data](https://www.fastmail.com/blog/use-unique-email-addresses-to-catch-companies-selling-your-data/) — Fastmail (read 2026-11-12) 6. [Proton Mail pricing](https://proton.me/mail/pricing) — Proton (read 2026-11-12) 7. [Creating aliases](https://proton.me/support/creating-aliases) — Proton (read 2026-11-12) 8. [How to get a domain name and email](https://tuta.com/blog/own-domain-email) — Tuta (read 2026-11-12) --- Postelva: Postelva registers domain names for private email — the address you keep when you change provider — paid in crypto with no KYC: no ID, only one verified email per domain. It is run by DomaineGoat LLC, a company registered in Panama; domains are registered through its ICANN-accredited registrar partner. A .com costs $12.49/year, the same price every year.