To find the name of the person associated with a user number, username, or UOD#, use the UNIX "finger" command after you've logged in to the central e-mail server ("mail.udel.edu" or "copland.udel.edu").
finger -m username
finger uod0664@mvs
finger firstname.lastname@mvs
finger firstname.middleinitial.lastname@udel.edufinger -m usernumber