DKIM
Also known as: DomainKeys Identified Mail
Definition
DKIM is an email authentication method that attaches a cryptographic signature to outgoing messages so receiving servers can verify the message genuinely came from the claimed domain and was not altered in transit.
Why it matters
DKIM, SPF, and DMARC together form the authentication baseline. Missing any of them materially increases the chance of landing in spam regardless of content quality.
AeroCampaign offers only DKIM-verified identities as From addresses, so an unauthenticated domain cannot be used by accident.