Why do i receive invites as emails?

[Sue]

We have 3 users on our XP set up. When receiving invites from the internet, 2
receive emails whilst the other gets an invite. I can't see any difference
in the set up.

Can anyone help please?

 

[Sue]

As an update to this - I can now receive invites to an email address that is
set up as "[email protected]" but not to one which is set up as "[email protected]"
Any ideas?