Hi Lisa,
What does your company use as their email platform?
There are a few products out there that manage email signatures company-wide, even enabling your company to have a 100% consistent email signature on all emails from any device - including iPhone, iPad, Android, anything.
If you are using Lotusnotes, head to http://www.crossware.co.nz - Crossware Mail Signature maintains your corporate image on every email, as well as offering advertising and compliance benefits for your company.
Otherwise, there are a few products for Exchange that can accomplish the same result 🙂
Rob