On 18/02/2020 01:48, Jeff Moskow wrote:

I recently replaced an older Linux Postfix server with a new OpenBSD
(6.6) and OpenSMTPD 6.6.0.

Most things are working fine, but email sent to my secondary MX server
never get accepted by my OpenSMTPD server -- they always get a 421 error
that looks like this:

        smtp failed-command command="DATA" result="421 try again later"

The secondary MX server is running OpenBSD/postfix and reports message
statuses like this:

        (host foo.bar.com[] said: 421 try again later (in reply to 
end of DATA command))

Does anyone have some suggestions on what I should be looking for/at to
diagnose/fix this problem?



If possible, try running OpenSMTPD in debug mode: 'smtpd -dv' and see if it provides more info.

Other than that, do you maybe have greylisting implemented?

Good luck,

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