Server Fault is a question and answer site for system and network administrators. It's 100% free, no registration required.

Sign up
Here's how it works:
  1. Anybody can ask a question
  2. Anybody can answer
  3. The best answers are voted up and rise to the top

Can I configure an exchange account in Microsoft Office365 E3 in catch-all mode? I want ALL the emails that are not sent to other accounts; it's possible?

share|improve this question
up vote -1 down vote accepted

You probably found your answer by now but, No.

According to the Microsoft Exchange Online for Enterprises Service Description: A catch-all mailbox receives messages sent to email addresses in a domain that do not exist. Exchange Online anti-spam filters use recipient filtering to reject messages sent to mailboxes that don't exist, so catch-all mailboxes are not supported.

you can download this document from:

share|improve this answer
You actually can, see my answer. – Massimo Dec 11 '13 at 12:49

You can create a catch-all mailbox by using a transport rule which redirects all messages addressed to unknown users to the catch-all mailbox.

However, in order for this to work, you will need to configure che SMTP domain as an "internal relay domain", as opposed to an authoritative domain; otherwise, Exchange will reject all messages addresses to non-existent users before even starting to process the transport rules.

share|improve this answer

Your Answer


By posting your answer, you agree to the privacy policy and terms of service.

Not the answer you're looking for? Browse other questions tagged or ask your own question.