My sincere thanks, Viktor. Removing the domain from $mydestination fixed the problem. Testuser2's message was properly delivered to the mailbox on the MDA server.
-----Original Message----- From: <[email protected]> on behalf of Viktor Dukhovni <[email protected]> Reply-To: "[email protected]" <[email protected]> Date: Friday, August 6, 2021 at 11:04 To: "[email protected]" <[email protected]> Subject: Re: [EXTERNAL] Re: Inbound/Outbound Settings on a Postfix Relay-Only On Fri, Aug 06, 2021 at 12:33:22PM +0000, White, Daniel E. (GSFC-770.0)[NICS] wrote: From which we can conlude that you've listed the domain in "mydestination" (domains delivered to local accounts on the MTA host), which requires that the recipient "testuser2" be listed in /etc/passwd, or in the local aliases(5) table. Viktor.
