Kevin Miller kevin.miller at
Wed Mar 11 16:28:54 GMT 2015

Additionally, it could be dependent on whether you're using the internal or external TNEF decoder.  Query the archives for TNEF and you'll find lots of posts about this issue.  No perfect solutions however.

I'll see it every once in a while from external users that are using Microsoft email clients.  I haven't had a problem lately however.  My settings are:
Expand TNEF = yes
Use TNEF Contents = replace
Deliver Unparsable TNEF = no
TNEF Expander  = internal
TNEF Timeout = 120

IIRC, when I began using "Use TNEF Contents = replace" things got better.

Kevin Miller
Network/email Administrator, CBJ MIS Dept.
155 South Seward Street
Juneau, Alaska 99801
Phone: (907) 586-0242, Fax: (907) 586-4500
Registered Linux User No: 307357 

From: mailscanner-bounces at [mailto:mailscanner-bounces at] On Behalf Of Alex Neuman
Sent: Wednesday, March 11, 2015 4:59 AM
To: MailScanner discussion
Subject: Re: bounce-message

As it says on the bounce, improperly configured Outlook settings prevent the message from being properly analyzed. Follow the instructions and change the outgoing message format to either HTML or Plain Text, as "Rich Text" is proprietary, has been obsolete for over a decade, and is potentially dangerous for your users.

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