Honored colleagues and experts.
I know this question sounds pretty common, but I can't figure this out, exactly!
I am the administrator of a Small Business Server 2011 network.
All clients run Windows 7 with Office 2010.
For some strange reason, one user, apparently only this one, is having problems by sending mails with attached PDF files to one certain external recipient. This recipient is seing attached files as the famous WINMAIL.DAT.
If this user, from the same physical computer is using his GMAIL, he is able to send to this recipient with success.
Also every single, other user within this SBS domain, is able to send attached docs to the recipient.
I first belived, that this was an obvious problem with settings or security with the recipient, but I am no longer sure.
Can anyone give me a hint?