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ATT00004.bin Attachments

Posted on 2014-07-14
Medium Priority
Last Modified: 2015-05-11
We have users sending/forwarding e-mails to internal employees and an "att00004.bin" file attaches to the e-mail being sent.  The problem is we are not allowing .bin files to pass through our mail server.

Has anyone seen this issue?  Any help would be appreciated.
Question by:scorpio66
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LVL 11

Expert Comment

by:Forrest Burris
ID: 40195493
(Assuming you guys are using Exchange)

This is most likely reminiscent of the old winmail.dat attachments of earlier Exchange. Meaning, a rich text issue. You can force HTML to all users by doing the following.

Organization Configuration > Hub Transport > Remote Domains > right click the object Default > click on Properties > select 'Never use' under Exchange rich-text format

Author Comment

ID: 40195609
Yes, we are using Exchange 2007.

I have it configured as you have explained but to no avail.  I also had the user changed the mail format in Outlook from HTML to Rich Text and vice versa but no still no luck.
LVL 11

Accepted Solution

Forrest Burris earned 2000 total points
ID: 40195646
Possibility the attachment was presented in the email BEFORE the text? IE: Someone pasted in a graphic and then followed it up with the description. Text needs to be in the message body before the attachment.

Supposedly this, "The Exchange server insists that message text must always be first and attachments must always be last. As soon as the Exchange software sees one attachment in a message, it stops looking for text, and treats anything else in that message as an attachment. Any remaining text sections are converted into attachment sections, and given fake file names (like "ATT00001.htm")"

Confirmed as a problem by Microsoft with Exchange 07 & 10: http://support.microsoft.com/kb/969854 .. if the messages follow the same pattern listed above that is.

Author Closing Comment

ID: 40770822
Thank you for your help!

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