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This document describes the meaning of "verified no" on incoming SMTP connections.
Here is an example of a "verified no" log message:
Wed Nov 17 10:00:20 2004 Info: New SMTP ICID 353419258 interfacePublicNet(10.111.123.234) address 22.214.171.124 reverse dns host unknown verified no
Log messages of this type indicate the following:
This condition is often seen for ISPs with poorly maintained DNS records.
This condition will typically not cause mail delivery to fail.
Cisco customers can throttle or block messages from domains with DNS issues.