Thanks David, it wasn't in the filter.

If it helps anyone in the future, the lack of "Unix::Syslog" meant (I presume) that there was output sent into the socket that should not have been. After installing the missing module all is fine.

Naturally the "working" server *did* have Unix::Syslog installed.

from mimedefang.pl -features

Archive::Zip                  : missing
Digest::SHA1                  : Version 2.11
HTML::Parser                  : Version 3.55
IO::Socket                    : Version 1.29
IO::Stringy                   : Version 2.110
MIME::Base64                  : Version 3.07
MIME::Tools                   : Version 5.420
MIME::Words                   : Version 5.420
Mail::Mailer                  : Version 2.09
Mail::SpamAssassin            : Version 3.003001
Net::DNS                      : Version 0.59
Unix::Syslog                  : missing



On 2012-10-03 14:18, David F. Skoll wrote:
On Wed, 03 Oct 2012 13:51:48 +0100
Dave <[email protected]> wrote:

On the new server any logic that hits a return ('REJECT' results in a
filter failure and a 451 4.3.2 Please try again later.

Please post your filter or a large-enough excerpt for us to diagnose.

Regards,

David.
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