Large-Site Address Verification & Spam/Virus Filtering

Speaker

David McLaughlin, Swiss Federal Institute of Technology (ETH Zurich)    mclaughlinid.ethz.ch

The presentation concerns recipient address verification methods employed by mail- filtering gateways at a mid-sized university. As spammers resort to the “dictionary” approach to spamming, verification of recipient addresses at the mail gateway can significantly reduce the load on your gateway and the mail servers behind it.

Outline

• Verification Methods:
  • smtp “callouts”
  • local database queries
  • ActiveDirectory
  • LDAP queries
• Placement of verification routers in the exim configuration file
• Filtering router and transport notes