Why when I email to Hotmail, Yahoo and MNS they seem to not get delivered?

These services are notorious for poor deliverability. Chances are they clocked the email from being received by the recipient. While there isn't much we can do on our end, you could try to set up some domain authentication with DMARK and DKIM criteria. Have your domain admin reach out to support@medicareprocrm.com so we can provide these details.

Also, if you are using a @gmail or @yahoo account you might consider setting up a domain name.