Xcitium Secure Email Gateway Enterprise

• Introduction To Comodo Secure Email Gateway
  • Login To The Secure Email Gateway Module
  • Get Started
    • Cloud Customers
    • On-premise Customers
  • The Main Interface
• The Dashboard
  • System Usage Graphics
  • About Software
• System Configurations
  • Services
  • Licenses
  • Configure System Settings
    • System General Settings
    • Cache Settings
    • Session Settings
    • GUI Customization
    • System Backup
    • System Restore
    • Log Upload Settings
    • Postmaster Settings
    • Web UI SSL
    • SMTP TLS Settings
    • Update Database
    • Syslog Server
  • Logs
    • Log Files
    • Purge Files
  • Tools
    • Check Connectivity
    • Clear SMTP Queue
  • Session Reports
  • System Usage Statistics
• SMTP Configuration
  • SMTP (Send E-Mail Protocol) Settings
    • General Settings
    • Advanced Settings
    • Outbound Delivery Queue
  • Manage Domains
    • Manage Domain Names
    • Manage Domain Routes
    • Manage Smart Hosts
    • Default Domain Routing
  • Secure Email Gateway SMTP AUTH Connector
    • SMTP Authentication Settings
    • Block Users
    • Anomaly Detection
  • LDAP/Local DB/My SQL User Database
    • LDAP Profile
    • Local DB Users
    • My SQL User Database
  • Greylist
    • Greylist Ignored IP Addresses/Domains
  • Manage RBL Servers
  • Disclaimer
  • SMPT Relay
  • DomainKeys Identified Mail (DKIM)
  • Outgoing SMTP Limits
  • Incoming SMTP Limits
• Modules
  • Anti-spam
    • Anti-spam General Settings
    • Authorized Trainers
    • Advanced Anti-spam Settings
    • Bayesian Training
    • Content Filter
    • Signature Whitelist
    • Attachment Filter
  • Anti-Virus
    • Anti-Virus General Settings
    • Advanced Anti-Virus Settings
  • Korumail Reputation Network (KRN)
  • Anti-Spoofing
  • SMTP IPS/FW
    • SMTP IPS General Settings
    • Whitelist IP Addresses
    • Blocked IP Addresses
    • Rate Control
  • Auto Whitelist
  • Containment System
  • Data Leak Prevention (DLP)
  • Attachment Verdict System
• Profile Management
  • Add And Configure A New Profile
    • Edit A Profile
    • Delete A Profile
• Reports
  • Mail Logs Report
  • SMTP Queue Report
  • Delivery Logs Report
  • SMTP-AUTH Logs Report
  • Summary Reports
  • Domain Reports
  • Attachment Verdict Reports
  • Original Mail Request
• Quarantine & Archive
  • Quarantine & Archive Settings
    • Quarantine & Archive General Settings
    • Email Reports Settings
    • Admin E-mail Reports Settings
  • Quarantine Logs
  • Archived Mails
• About Comodo Security Solutions

Greylist

•  Click 'SMTP' > 'Greylist' in the left menu.

• Greylisting is another form of spam control whereby Secure Email Gateway will temporarily reject mail from senders it does not recognize. Instead, it will send a 'try again later' message to the sending mail server.

• Upon receiving this message, legitimate mail servers will try to resend the mail after a delay. Secure Email Gateway will accept the resent mail providing it does not fall foul of its other filters.

• However, because of the prohibitive cost of re-sending millions of mails, spam servers are unlikely to perform this simple resend  This means greylisting can be very effective at blocking large amounts of spam at source.

• You have the option to disable greylisting entirely, or you can specify IP addresses/domains as exceptions (so CSEG will accept mail from them on first contact).

See 'Greylist Ignored IP Addresses/Domains' for how to add domains, networks and IP addresses to Greylist ignored list.