Signal & Syntax · Email deliverability
What Is a Catch-All Domain?
A catch-all domain accepts email for every address at the domain. The server answers 250 whether the mailbox exists or not.A catch-all domain accepts email for every address at the domain. The server answers 250 whether the mailbox exists or not.A catch-all domain accepts email for every address at the domain. The server answers 250 whether the mailbox exists or not.
Also calledaccept-all domain · catch-all email
Example
RCPT TO:<anything@catchall.example> 250 OK
Catch-All Domain in Practice
A catch-all setup stops mail from bouncing on a typo. The same setup hides from an A catch-all setup stops mail from bouncing on a typo. The same setup hides from an A catch-all setup stops mail from bouncing on a typo. The same setup hides from an SMTPSMTP check whether a mailbox exists. Mail to a missing mailbox on a catch-all domain lands in a shared inbox. Other servers discard the mail later instead. check whether a mailbox exists. Mail to a missing mailbox on a catch-all domain lands in a shared inbox. Other servers discard the mail later instead. check whether a mailbox exists. Mail to a missing mailbox on a catch-all domain lands in a shared inbox. Other servers discard the mail later instead.
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Guide
MX Records, SMTP Codes and Bounces Explained
How an email finds a mailbox, and how the server answers. Read the guide →Run the Checks on Your Own List
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