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User Guide for AsyncOS 11.1 for Cisco Email Security Appliances - GD (General Deployment) - Validating Recipients Using an SMTP Server [Cisco Secure Email Gateway] - Cisco
217.108.0.0/16 - bgp.tools
SMTP Relay in Office 365 environment | Troubleshooting scenarios |Part 4#4 - o365info
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Clint Boessen's Blog: 2010
