what to do after an IP change

[Ben Vitale <bsvitale@xxxxxxxxxxx>]

Hi,
 If my cable provider changes my IP while the computer is running, what 
can I do to update my local hostname?  e.g., the part after bvitale..

[bvitale@pcp0010126256pcs ~]$

 The reason I ask is because after the IP change, sendmail no longer 
forwarded my local LogWatch messages properly, because it was trying to 
send from a hostname that was no longer valid.

Thanks,
Ben