[PLUG] Weird handling of incoming attachments in dovecot--winmail.dat file

[Greg Helledy <gregsonh@gra-inc.com>]

My users get emails generated by Outlook from a government agency.  Our 
mailserver is dovecot running on CentOS 7.  When these emails have 
attachments, something strange happens:

-some users see the attachments correctly (Excel spreadsheets being the 
most common)
-other users get a winmail.dat file.

All users are using Thunderbird as a mail client.  The issue does not 
seem to be confined to the mail client--if the users go into webmail 
(Horde), the ones that get the winmail.dat still see information jumbled 
together (i.e. not handled as expected), while those who get the 
attachments properly in T-Bird also see it properly in webmail.

I want to make it clear that, although what I read implies this is 
strictly the result of Outlook, the same email sent from the agency to 
two users at our company is displayed in two different ways.

Basically, our server seems to be doing something weird with incoming 
attachments, on a per-user basis.  Anyone ever had this?  What would I 
look at to try to fix it?

Thanks,
--
Greg Helledy
GRA, Incorporated
P:  +1 215-884-7500
F:  +1 215-884-1385
www.gra.aero
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