Identified sender and the mail is not tampered
The mail is signed but definitely tampered. Do not rely on the contents or click on any links therein
The mail is not signed. If you know the sender you should ask him to xorkeesign his mails particularly if it is on sensitive subjects or involves money.
This can appear due to one of the following reasons
Your HR or other responsible person in your organization attests your identity particulars in xorkeesign. This is the most flexible as it enables your mails to reflect your qualification, your role, personal attributes like gender, age, profession, etc., none of which will be available in the other modes of mail signing. This is of immense value while carrying out business and personal correspondence.
The attestor should have a DSC that contains the organization name.
If you have a DSC or willing to obtain one you can use that for signing your mails. Some people may consider this to be of more value due to its recognition in the IT Act. However, the primary reason for signing the mail is protecting them, perceived legal benefits like non-repudiation are of limited importance.