Email is used for many different things. You often have to give an email address to create an online account, be added to a mailing list, converse with friends and family, and a host of other reasons. It is a good idea to have distinct email accounts for these different needs. Worried about your inbox filling up with spam? Have one just to give out when it is required online. Have another more personal one to give to loved ones. And always keep your UTHSC account for UT business only.