By default, if someone sends an email to your domain to an address that doesn't exist they will get an error message that says that the mailbox doesn't exist.
If you would prefer you can either collect the incorrectly addressed email or send a custom reply. This is called Catch-All Configuration.
To set this up, login to your control panel and click the Mailboxes link.
From the top menu, click on Catch-All Configuration.
This will show your current catch-all configuration - if you haven't configured it yet it will be disabled. Click Edit to configure your rule.
You have the following configuration options:
- Bounce with phrase: this allows you to enter some text that will be sent to the original sender informing them that their message could not be delivered. This also allows you to state alternative email addresses to retry if you wish
- Forward to address: this allows you forward the received email to another mailbox. The original sender won't be informed that this has occurred. This gives you the chance to check misaddressed email before deleting it (however it is possible that you will receive a high level of spam email, as many spammers generate random email addresses to send mail to)
Click Submit when you are ready to save your catch-all rule.
If you wish to disable the rule at a later time, simply return to the configuration page, click Disable and then Submit.