I am somewhat perplexed by the following problem.
Our organization uses an Exchange 2010 server and Outlook 2010 clients. The server itself was recently installed but we have been using Outlook 2010 for quite some time now.
For some strange reason attachments file types are being modified and I am unable to figure where the problem lies.
Here is a typical situation:
User1 and his assistant both communicate with the same client on a regular basis. The client sends a message to user1 with a pdf attachment but it is received as an ATT00001.bin file. The same client sends the exact same attachment to the assistant and she receives the .pdf file with no problems.
Logically if it was my server both users would either get the attachment unchanged or changed but not as mentioned above.
I am thinking that maybe the sender has a config problem but this problem has become more frequent recently and is affecting more users. I suspect something in my environment but I am quite stumped.
Could it be my Watchguard XTM or maybe a configuration problem I haven't yet spotted on my Exchange server...
Anyone out there have any ideas?
Thank you in advance for your help.