“They can’t testify against each other as long as they’re united in wedded bliss.”
Truth. I haven’t seen any signs of an impending divorce.
Are they both beards? ;o)
Any communications between spouses are privileged from use only if they have not been overheard by others.
In that event the privilege is destroyed.
“Overheard” would include, I suppose, publishing them in e-mails.