Email problems with new LG 4G, new LG tablet, old Nexus 7 tab - I removed an email account and cannot add it back

[AC Question]

Email problems with new LG 4G, new LG tablet, old Nexus 7 tab - I removed an email account and cannot add it back

all of a sudden last night my new LG4 4G smartphone and LG tablet (7") as well as my nexus 7 tablet have stopped storing emails. i deleted one email address and cannot re-install it. Help!