What free mails do you not accept

I'd like to take advantage of the option under 'email' field, which lets you block free-mail submissions.  I know how to prevent it from moving forward in general, but I want to put up a message (which is triggered because the email address includes one of these addresses) that lets the user know WHY the field is not working.  Otherwise, as it stands out of the box, it just shows red, but no clarity to user.  Can you provide the list that is screened for this blockage, so I can list those?  Thanks.

We actually accept every email address whether it is free or not. However, I may have been misunderstanding your inquiry. Are you asking what are free email address domains that is available online or are you referring to domains that we have issues sending to or rejecting?

We look forward to your response.

Thanks.

There is an option in the regular email field type, where you can select "do not accept free email account".  This is a way to force the user to use non-yahoo type accounts.   It serves my purpose, but I'd like to know what the list of emails are that trigger this option, because I'd like to include a note that pops up when a "free" email is used, telling the user "sorry, we don't accept...." and list out the various email domains that don't qualify for this field.  

The free email addresses that are not allowed are gmail, aim, outlook, hotmail, yahoo, mail and inbox.