For a very formal wedding, steer clear of using email. But for a less formal wedding you could use this method, just make sure that you know who has email and who does not. Perhaps to be on the safe side, give your guests the option to respond to you, using both methods, email and posting.
k
Written by
kerry
More to read

Planning
May I bring a guest to the wedding, even though the invitation doesn't specify "plus one"

Planning
I have a two year old niece. Do you think she is too young to be my flower girl?

Planning
What are the top wedding gift no-no's

Planning
Maid of Honour Responsibilities and Duties

Planning
Best Man Speech: How to Write One, With Examples and a Template

Planning