Email authentication (or email validation) is the process used by receiving mail servers to verify the legitimacy of an email message.| postmarkapp.com
Email deliverability is the ability to deliver an email to a recipient's inbox in a timely manner.| postmarkapp.com
Domain reputation is the opinion receivers have of your domain, which helps them decide if your emails should make it to a recipient’s inbox instead of being rejected or ending up in a spam folder.| postmarkapp.com
IP reputation is the level of trust inbox providers place on your sending IP (Internet Protocol) address and important factor in guaranteeing email deliverability.| postmarkapp.com
DMARC is an email security standard that allows domain owners to monitor who’s sending email using their domain & tells receivers how to deal with emails that aren’t sent from authenticated sources.| postmarkapp.com
SPF (Sender Policy Framework) is an email authentication standard that helps detect forged sender addresses, protecting senders and recipients from spam, spoofing, and phishing attempts.| postmarkapp.com
DKIM (DomainKeys Identified Mail) is an email authentication method that uses public-key cryptography to sign emails and verify that the message body and attachments were not altered in transit.| postmarkapp.com