Hi dactapeppa.
Please check your account settings to make sure that it's not causing your receiving issue. Visit the solution articles below for the complete instructions.
http://windowslivehelp.com/solutions/settings/archive/2009/02/18/not-receiving-e-mail-from-contacts.aspx
http://windowslivehelp.com/solutions/settings/archive/2009/03/03/how-to-set-or-change-reply-address.aspx