[Exim] Mailer-Daemon and MX backup servers

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Author: Terry Edhouse
Date:  
To: exim-users
Subject: [Exim] Mailer-Daemon and MX backup servers
    I'm having problems getting my primary mail server (running v3.22) to
accept error messages from my backup servers.

    The message reported in the rejectlog file is :


there is no valid sender in any header line (envelope sender is <>)

Even though the message contains :

From: Mail Delivery System <Mailer-Daemon@???>


I have the following options set in the config file :

headers_check_syntax
headers_sender_verify_errmsg
sender_verify

And the backup server negated in the sender_verify_hosts list.

I've even added Mailer-Daemon to an alias file which is used for sender
verification.


Can anyone help?

--Terry