When delivering wedding invitations by hand, it is not necessary to use a full address on the outside envelope, according to Crane & Co. If the wedding is formal, both inner and outer envelopes should be hand-addressed, regardless of delivery method.
Wedding invitations being delivered by hand need a personal touch. They should be placed into the hands of the recipient personally, rather than being handed to someone else to deliver, left in a mailbox or deposited on a desk.
As for wording the addresses, Crane & Co. offers detailed instructions on writing invitation envelopes for every type of guest, including unmarried couples living together, couples with adult children living at home, couples in which one or both parties are doctors or judges, diplomats and military officers.