Mind has gone blank - which is correct:

[MirandaGoshawk]

They have each others' email addresses

or,
They have each other's email addresses

Is it the second one?

Bearing in mind that this is a group of people, not just two.

TIA

So if you have suggestions for useful lines please pm myself ;)

I tell you, Stealth, it's the curse of PC, correcting others' grammar means you make a mistake of your own!

Muphry's Law. It's a known thing.

I knew it had a "Law", I just couldn't remember it. Thanks