Try Mail settings->Accounts[ and Import]->Grant access to your account (from the source account). The delegated-to account must be in the same Apps domain. It's only mail, and opens in another tab/window. The source account can then remove access to individual delegates.
While watching the Science Channel I could not help but to struggle with my educational decisions. I can't decide what to do with my time . . . physics, computer science, or just call them a masters and doctorate respectively and finish my bachelors in engineering.