e-mail from AS/400

Hello All,

We are sending alert e-mail from our AS/400 to our cell phone.  This allow us 
to response to cycle and backup error.  We now have an issue where two of our 
operator are not getting the alert message. The first two cell phone are with 
Cingular and the other two are Nextel.  The Cingular cell phone are getting the 
alert messages, but the Nextel are not.  We were thing that Nextel has put in a 
block that stop our e-mail from going because we do not have an return e-mail 
setup on the AS/400, that I know of.

I also noticed that when we send e-mail from the AS/400 it has our old company 
name on it, as the sender.  How do we change this?