You are seeing this only for some users? Is there any connection between these users?

Are all outgoing messages from these accounts affected or do internal messages work fine?

I have to admit that I can't understand what could be causing the text you have shown us. I wonder whether there is some other stage of the mail-sending process which is causing this. Do the affected signatures contain any HTML, PHP, JavaScript or some other code?

One thing that has just occurred to me - are you viewing these strange bits of text in Word (used by Outlook)? It's just that it looks like a Word field entry. Don't know why that would show up though.

Hello

We have signatures set up for all our staff, where it has there name, address, phone numbers, email and then a disclaimer.  Now upon updating our signatures most of the staff's work fine but I have a few that have the following printed before their names...