Domain Catchall in Zimbra

Sometimes, it may require to receive all emails by an email account under a domain non-existence account. It would require mostly in below scenarios.

a.    You have deleted some email accounts from your server under a domain name. Now, you want to receive all of their emails.

b.    You would like to monitor all of the emails received to your domain non-existence account.

c.     You configure a new server with minimal email accounts.

d.    You just migrated your email service into a new platform/server. However, you did not create all of the email accounts.

Solution:

It is wise to create a catchall account so that all the emails for the non-existence accounts shall forward to this catchall account.

Test Case:

Catchall account: afsher@example.com

Non-existence account: webmaster@example.com, hostmaster@example.com, nobody@example.com

Execute below commands:

root@mail:~# su - zimbra

zimbra@mail:~$ zmprov modifyAccount afsher@example.com zimbraMailCatchAllAddress @example.com

If the email arrives for the non-existence users "webmaster@example.com", "hostmaster@example.com", and "nobody@example.com", it will be delivered to the catchall account "afsher@example.com".

Drawback:

This setting will increase the amount of spam delivered, and can lead to being blacklisted the IP address of the server.

Undo Catchall:

To remove the catchall from an email account, unset the catchall address:

zimbra@mail:~$  zmprov modifyAccount afsher@example.com zimbraMailCatchallAddress ""