I've just got this problem last night. I'll explain: Any e-mail which is sent from the exchange server, gets the subject line corrupted. Weird characters and symbols get inserted randomly. It also seems to insert text from anything else passing through the e-mail server.
Here's an example:
Normal subject line: testing email
Corrupt subject line: ???? ???James Llewellyntesting email
I sent that e-mail to a test address outside of the company, and it inserted some question marks and my full name in to the subject line automatically. It does this for everyone in the company. Mostly like the example, however some have chinese characters inserted, or funny symbols. It dont always insert the name like the example, but includes text like: MDB Transport Queue Folder. All by itself, its really strange; i can't find any information on it.
This happened about a year and a half ago. I restarted the server and it never returned until now... I restarted the server last night, but i wasn't in a position to properly test it. However i gets a call this morning saying its acting up again so that obviously didn't work; if it did, then only for a short time.
The users outlook clients vary from 2000 - 2003.
In the example i mentioned above. The corrputed subject line appears in the message saved in the sent items folder, however the recipient didn't get a corrupted subject line on receipt of the message. I would like to believe this is the case and that it's only affecting the users internally, but i think it is also affecting external recipients.
I've considered faulty hardware, but the problems exhibited are too particular for it to be a hardware fault.
Can someone please help me? I'm hoping some of the gurus have seen this problem before. Otherwise i'm stuffed!