Check out the most amazing free tool provided by Alpha Sandesh i.e., Domain Key Generator or in other words Domain Keys Identified Mail ( DKIM ) The user can check the domain of the from address matches the domain that is sending the message. Domain Keys do not validate the domain of the return path.
DKIM (Domain Keys Identified Mail) is an email verification strategy that enables the recipient to browse that an email was to be sure send and approved by the owner of that domain. This is finished by giving the email a digital signature. This DKIM signature is a header that is added to the message and is verified with encryption.