Mark Delany is an Australian computer programmer and consultant specializing in e-mail

Email

Electronic mail, commonly known as email or e-mail, is a method of exchanging digital messages from an author to one or more recipients. Modern email operates across the Internet or other computer networks. Some early email systems required that the author and the recipient both be online at the...

 infrastructure, and anti-spam techniques.

He is the chief architect and inventor of DomainKeys

DomainKeys

DomainKeys is an e-mail authentication system designed to verify the DNS domain of an e-mail sender and the message integrity. The DomainKeys specification has adopted aspects of Identified Internet Mail to create an enhanced protocol called DomainKeys Identified Mail...

, an e-mail authentication

E-mail authentication

Email authentication is the effort to equip messages of the email transport system with enough verifiable information, so that recipients can recognize the nature of each incoming message automatically...

 system designed to verify the DNS domain of an e-mail

E-mail

Electronic mail, commonly known as email or e-mail, is a method of exchanging digital messages from an author to one or more recipients. Modern email operates across the Internet or other computer networks. Some early email systems required that the author and the recipient both be online at the...

 sender and the message integrity. Mark is one of the authors of DomainKeys Identified Mail

DomainKeys Identified Mail

DomainKeys Identified Mail is a method for associating a domain name to an email message, thereby allowing a person, role, or organization to claim some responsibility for the message. The association is set up by means of a digital signature which can be validated by recipients...

, a development of DomainKeys.

He was also lead architect for Yahoo! Mail
.