Hello there.
If we have not met yet, my name is Warren Sealey, and I am the Technical Director for Symantec Email Security. As part of my role, I regularly speak to customers with highly aggressive attitudes towards phishing, ransomware and malware. Although we already offer industry leading SLAs for threat detection these customers have shared requirements for controls which they feel will make them safer.
Amongst these requests we have been asked to stop all emails which contain certain types of URL, emails where the domains used have been recently registered, and emails from particular parts of the world.
Whilst we recognize that these are valid ...