The default signature when you send an email from your iOS device will read:
- Sent from my iPhone
Now I can excuse somebody for a while but when that somebody has had an iPhone 3, iPhone 4 and iPad... AND they work in IT... AND they are the director/head of ICT support/head of IT business and communications, I personally find it quite unprofessional that they are still sending out emails without their name, title, contact details or department address.
So for those people:
1. Settings > Mail,Contacts,Calendars > Signature
2. Fill in the text box with the relevant details.
Either that or they just want everyone to know the have an Apple device.