Mail.com is a legitimate domain that is able to accept new email. The domain has proper DNS MX records (mx00.mail.
com), which indicates that the domain is able to receive mail. Additionally, the domain has a valid SSL certificate, which indicates that the site is secure. Therefore, it is safe to use Mail.com as a source for email.
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Rocketmail.com is a valid domain that is able to accept new email. The domain has proper DNS MX records (mta5.am0. yahoodns.net), and the website appears to be legitimate.
Sina.com is a legitimate domain with proper DNS MX records (freemx2.sinamail.sina.com.cn). This means that email sent to sinamail. com.cn will be delivered to the appropriate mailbox.