Mailing list not accepting ALL email addresses?

Hi,

I am setting up the mailing list section within the Responsive Directory theme 6.5.

All seems to working OK – eg – web form submits OK – confirmation email is sent OK and when the confirm link is clicked you are redirected to the thank you page OK.

The problem is – only SOME email addresses are added to the mailing list as subscribers.

Emails addresses like @hotmail and @gmail etc are added to the subscribers list OK – but If I try to register an email address from ANY domain related email address like – info@anydomain.com – the email address is not listed in the subscribers area.

Its like email addresses with domains from websites are being blocked somehow.

It won’t even let me import an email address other than @hotmail and @gmail etc?

Has anyone else experienced this or know what I need to do to fix this within the theme or server settings?

Thanks.