Postfix alias not working from outside

SYSTEM INFORMATION
OS type and version CentOS 7
Webmin version 1.990
Virtualmin version 6.17
Related packages Postfix

I have added aliases to a domain. The alias shows up in /etc/aliases as well as /etc/postfix/ virtual.

I can send from a local account on the same domain, but outside email says the address can not be found.

iagnostic-Code: smtp; 550 5.1.1 Recipient address rejected: User unknown in virtual mailbox table

I have restarted postfix a few tims.

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