We have Cisco Ironport C170 ESA, I need to know if there is some resource to validate e-mails from a sender. For example, I would make sure that a person who is sending e-mails and not a robot, this could be done with captcha request.
If no such resource, I would like to know if there is any possibility of users to create a list of who can send e-mails to them, ie one WhiteList per domain.
Table of ContentsIntroductionVersion HistoryPossible Future
UpdatesDocuments PurposeNAT Operation in ASA 8.3+ SectionsRule Types
Network Object NATTwice NAT / Manual NATRule Types used per SectionNAT
Types used with Twice NAT / Manual NAT and Network Obje...
Table of Contents Introduction:This document describes details on how
NAT-T works. Background: ESP encrypts all critical information,
encapsulating the entire inner TCP/UDP datagram within an ESP header.
ESP is an IP protocol in the same sense that TCP an...