ipconfig:
> Hi all,
>
> I know this isn't a microsoft exchange forum, but I was hoping maybe someone
> could help me eliminate any potential configuration problems with postfix
> IRT the error I'm seeing on my exchange transport server.
>
> Disclaimer: I'm a complete noob with postfix. And pretty noobish at
> Exchange.
>
> Ok, here it is:
> I have a postfix server relaying email between two domains. Both domains are
> using exchange 2019. Default receive connectors in both domains are set up
> to use mutual auth TLS and exchange server authentication, with the
> "exchange servers, legacy exchange servers, and exchange users" permissions
> groups.
>
> TLS is working and emails are forwarding to the right locations, both from
> accounts on the postfix server itself and domain to domain. Also, email is
> working fine from domains to accounts on postfix server. No errors seen in
> the maillog on the postfix server, getting a trusted TLS connection to each
> edge transport server and getting a "mail queued for delivery" response from
> the edge transport servers when I send mail.
>
> The problem is, emails to the domains are sitting in the edge transport
> server queue with the error "A matching connector cannot be found to route
> the external recipient." Message source name is "Default internal receive
> connector."
There are 2.6 million web search results for this error message. I
suggest that you look there.
The non-Postfix mail server can't figure where to send mail for
some recipient(s). It never even tries to connect to Postfix,
otherwise the error message would be different.
> I have a valid send connector configured, the postfix server, and as
> mentioned emails are sending to accounts on that server fine.
>
> Does anyone know what can cause this? Is it an authentication problem? Are
> there any commands I can run on the postfix side to help troubleshoot this?
That would be pointless as the never even tries to connect to Postfix,
because it doesn't know where to deliver the recipient.
Wietse
