451 4.3.5 Server configuration error

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451 4.3.5 Server configuration error

Dino Edwards
Hello,

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=<[hidden email]> to=<root@localhost> proto=ESMTP helo=<server.domain.tld>

I also get the following email in my admin mailbox:

From: Mail Delivery System <[hidden email]>
Subject: Postfix SMTP server: errors from localhost[::1]
To: [hidden email]

Transcript of session follows.

 Out: 220 server.domain.tld
 In:  ehlo server.domain.tld
 Out: 250- server.domain.tld
 Out: 250-PIPELINING
 Out: 250-SIZE 52428800
 Out: 250-VRFY
 Out: 250-ETRN
 Out: 250-STARTTLS
 Out: 250-ENHANCEDSTATUSCODES
 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 [hidden email] 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.

Thanks



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Re: 451 4.3.5 Server configuration error

Wietse Venema
Dino Edwards:
> Hello,
>
> 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=<[hidden email]> to=<root@localhost> proto=ESMTP helo=<server.domain.tld>

The error is logged BEFORE this line.

        Wietse
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