> I've recently installed RedHat 8 along with BIND and Postfix. The server
and all applications are patched to the most recent versions. My Postfix
server (runlevel6.com) can send mail just fine, but it can't receive mail.
It can, however, send mail from itself to itself on the same machine.
>
> Connecting remotely to the SMTP port on the mail server results in the
following:
> telnet runlevel6.com 25
> 220 ns1.runlevel6.com ESMTP Postfix
> 500 Error: bad syntax
>
> Connecting via an email client either fails to send (with MS Outlook) or
bounces with the following error:
> "The following addresses had transient non-fatal errors..."
>
> Nothing appears in the Postfix log when these connections are attempted.

First things first.

Look at your logging. See if there is something wrong in your syslog setup.

Does it log the local attempts?

You must get logging working to be able to see what is happening.

--Eric

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