What is catch-all email?
What is catch-all email?
A catch-all (sometimes called a "catch address") is a safety net for your entire domain. Normally mail only arrives at addresses that actually exist; if someone sends to an address you haven't created, their message bounces. With a catch-all you open that door instead: every address on your domain that doesn't explicitly exist is automatically forwarded to one designated mailbox.
Compare it to a large office building where mail for an unknown name still ends up at reception instead of being returned. Reception then works out who it's meant for. You'll find the short definition in the term catch-all.
Why companies use a catch-all
For an office manager or SME, a catch-all solves a very concrete problem: mail that gets lost through small mistakes. A few benefits:
- No missed mail through typos. If a client writes
inof@yourbusiness.beinstead ofinfo@, the mail still comes in rather than disappearing. - Use addresses flexibly without creating them. You can put, say,
project-today@yourbusiness.beon a quote or form and still receive it, without setting up an address first. - An overview of who mails where. Because everything comes in, you see which addresses people (or services) use. Handy for discovering which addresses you actually want to make official.
For organisations with a lot of client contact by email, that safety net is reassuring: nothing slips through the cracks. It can also be handy during a reorganisation: if something changes about the addresses or an employee leaves, incoming mail keeps being caught in the meantime. That way you don't lose client contact while you're getting things back in order.
How does a catch-all work?
A catch-all is essentially a rule at the domain level. Here's what happens when mail comes in:
- A message arrives at an address on your domain, for example
sales@yourbusiness.be. - The server checks whether that address exists. If it does (a real mailbox or an alias), the mail goes there. The catch-all isn't involved.
- If the address doesn't exist, the catch-all steps in and sends the message to the designated catch mailbox.
- You read it in that mailbox, along with the rest of the caught mail.
So the catch-all only kicks in for addresses you haven't created. Existing mailboxes and aliases keep receiving their own mail. We explain the setup itself in setting up a catch-all.
What to watch out for
A catch-all sounds like pure upside, but there's a flip side. Keep this in mind before you turn it on:
- It's a spam magnet. Spammers often gamble on random addresses (
sales@,admin@,john@). With a catch-all, all that junk comes in to you instead of being rejected. Good spam filtering is then not a luxury but a necessity. - You lose some overview. Everything lands in one pile. Set up folders, labels or filter rules to separate real mail from noise.
- Consider aliases as an alternative. If you know exactly which addresses you need (
info@,sales@,invoices@), separate aliases are often tidier and safer than a catch-all that lets everything in. - Use it deliberately. Many companies turn on a catch-all temporarily to see which addresses are circulating, then switch to fixed addresses and aliases later.
In short: a catch-all is a handy safety net, but use it consciously and make sure you have solid filtering.
And at Mailflux
At Mailflux you mail on your own domain, with the flexibility to arrange your addresses the way you want. Every plan includes antivirus, antispam and antimalware with ML-driven filtering, exactly what you need when you work with a wide safety net. On top of that you get 20 free aliases per mailbox, so you can often set up all the addresses you need neatly without a catch-all.
If you do want to bring all mail on your domain in centrally, we'll help you set it up properly, with the right filtering alongside it, so spam doesn't stand a chance. All hosted in Europe and GDPR compliant, without needless bells and whistles. Read more about mailing with your own name behind the @ in email on your own domain.
FAQ
Frequently asked questions
What is the difference between a catch-all and an alias?
An alias is one specific extra address that you deliberately create and forward to a mailbox. A catch-all, on the other hand, captures all non-existent addresses on your domain. An alias is targeted and safe; a catch-all is a broad safety net that also pulls in more spam.
Do I get a lot of spam with a catch-all?
Usually more than without one. Spammers try random addresses on your domain, and a catch-all lets them all in instead of rejecting them. Good spam and malware filtering is therefore essential when you use a catch-all.
Do I really need a catch-all?
Often not. If you know which addresses you use, separate aliases are usually tidier and safer. A catch-all is mainly handy as a safety net against typos or to temporarily see which addresses people use.
Can I combine a catch-all with aliases and mailboxes?
Yes. Existing mailboxes and aliases simply receive their own mail; the catch-all only kicks in for addresses that don't exist. That way you use fixed addresses for what you know, and keep the safety net on hand for the rest.
Is a catch-all safe for my privacy?
A catch-all brings in more mail, including spam and sometimes abuse attempts, so good filtering matters. At Mailflux that mail lands on servers in Europe, GDPR compliant, with antivirus, antispam and antimalware in every plan. Also turn on two-factor authentication for extra protection.