custom table - delivery class?

I need to create a z-table to list the email-ids that I want to notify to, in case of program errors. Should I make the delivery class of this table 'C'? And is best practise to make the data transportable? Or should my users just enter data in each system.

I am kind of confused...Could any of you please clear me on this concept of Deliver class please. Your help is very much appreciated.

thanks!