DomainKeys (DKIM)

DomainKeys is an authentication technology, developed by Yahoo, that works by creating a digital signature of the contents of an email.

This digital signature is verified by the receiving mail server to ensure that it is not forged. DKIM is a variant of DomainKeys and is also supported by the application. To enable DomainKeys, you must enable Sender Authentication when scheduling an email message to be sent. Both DomainKeys and DKIM can optimize your email message delivery to Hotmail, MSN, and Yahoo! email addresses.