DomainKeys is a standard for authenticating email developed by Yahoo!. It is used by ISPs to ensure that purported senders of email messages are actually the ones presenting the messages they review.
AWeber authenticates using DomainKeys Identified Mail (DKIM)
In order to ensure optimal deliverability of messages, AWeber authenticates using DomainKeys Identified Mail (DKIM) for its outgoing email messages.
For more information on DKIM and other standards that affect the deliverability of email messages, review the complete article on email authentication.