Am just importing a list for a client which includes some married couples!
How does CM deal with a record such as....
John & Jane Smith,email@example.com
When email arrives will it say "Dear John & Jane"?
If you use the standard [firstname] tag, then it would say 'Dear John', because it just takes the first word from the name.
To get what you are after, you'd want to create a custom field for the shared name, which would contain 'John and Jane'. Then you would insert that custom field in your email instead.
Does that make sense?
That's clear, thanks Mathew.