Curious. Did they check their spam folders to see if the invitation was routed there?
More importantly do any hotmail accounts receive any WP or BP emails?
This is nearly always a problem with the way your domain email records are configured , Hotmail and others will be doing SPF checks which doubtless are failing
Interesting. Hotmail users do not receive email from my BP site also. @hugo, is there a DNS tweak that’s needed to make sure domain is configured properly? Sorry…I don’t know what an SPF check is.
google is your friend, but yes it’s a domain record a txt record that confirms that your server is authorised to send emails under that domain – you may also need a ptr record reverse dns lookup as that also can be used to check a server even though it’s not a mandatory record to have.
SPF can be configured via an online tool or a record produced that you can copy/paste to your dns records.