Update line 15 of that page from:
$WA_MailObject = WAUE_Definition("smtp.office365.com","25","JRV Distorted Works","ecart","","");
to:
$WA_MailObject = WAUE_Definition("","","","","","");
By leaving the values blank, it will use the server defaults for them, which should be correct by default... if not, try:
$WA_MailObject = WAUE_Definition("relay-hosting.secureserver.net","","","","","");