Having a strange issue with a server. Multiple times a day I get the following 
errors in mail.log:

451 4.3.5 Server configuration error; from=<r...@server.domain.tld> 
to=<root@localhost> proto=ESMTP helo=<server.domain.tld>

I also get the following email in my admin mailbox:

From: Mail Delivery System <mailer-dae...@server.domain.tld>
Subject: Postfix SMTP server: errors from localhost[::1]
To: postmas...@domain.tld 

Transcript of session follows.

 Out: 220 server.domain.tld 
 In:  ehlo server.domain.tld
 Out: 250- server.domain.tld
 Out: 250-SIZE 52428800
 Out: 250-VRFY
 Out: 250-ETRN
 Out: 250-STARTTLS
 Out: 250-8BITMIME
 Out: 250 DSN
 In:  mail FROM:<root@ server.domain.tld > size=527
 Out: 250 2.1.0 Ok
 In:  rcpt TO:<root@localhost>
 Out: 451 4.3.5 Server configuration error
 In:  rset
 Out: 250 2.0.0 Ok

Session aborted, reason: lost connection

For other details, see the local mail logfile

So, it looks like some process is trying to send email from 
r...@server.domain.tld to root@localhost but I don't know what process it is or 
how to make it stop.

It doesn't seem to affect the server otherwise. Other email flows in and out as 
normal except for these errors.

I would appreciate some insight on where to look to get this resolved.


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