What are the rules for addressing save the date envelopes?

There are no official rules for addressing save the date envelopes, but following invitation etiquette keeps things clear and kind. Use full names, not nicknames, and include titles such as Mr, Mrs, Ms, Dr, or Reverend if you know them. For a married or engaged couple with the same surname, write both first names on one line, for example Mr and Mrs James Smith. For a couple with different surnames, write each name on a separate line. For a family, address the envelope to the parents and add "and family" if children are invited. If you are unsure who is invited, it is kinder to send a save the date only to those who will receive a full invitation later. For same-sex couples, the same rules apply, just use the names and titles they use. If you are not sure of a guest's title or name, ask a mutual friend or family member rather than guessing. You can also use "and guest" if someone may bring a partner, but it is better to find out their name before the invitation stage.