ASRG | Anti-Spam Research Group | PRA | Purported Responsible Address Sender ID |
BATV | Bounce Address Tag Validation | SPF | Sender Policy Framework |
DKIM | DomainKeys Identified Mail | SRS | Sender Rewriting Scheme |
DSN | Delivery Status Notification bounce | SMTP | Simple Mail Transfer Protocol |
MARID | MTA Authorization Records In DNS | SMTP AUTH ESMTPA authentication | |
PGP | Pretty Good Privacy | S/MIME | Secure / MIME |