If there is an email address provided in public WHOIS, it is a valid email address for the domain owner. Any email sent to that address will automatically forward to their real address. The address provided in WHOIS has a very short lifetime before it will expire, at which point a new address will appear in WHOIS. It is recommended you double-check the domain’s WHOIS information every time you attempt to send email to the domain owner. We have no way to confirm that your communication has been received, or read by the intended recipient.
If there is no email address listed in WHOIS, there will be a link that can be used to email the domain owner.