FortiGate Next Generation Firewall utilizes purpose-built security processors and threat intelligence security services from FortiGuard labs to deliver top-rated protection and high performance, including encrypted traffic.
When the client builds its message list, it retrieves envelopes first. FortiGates do not process these envelopes because they do not contain enough information to make a decision.
During the next step, the client retrieves the message bodies -- it is this content that the FortiGate uses for spam analysis and subject tagging.
Some clients (Outlook express, Mozilla Thunderbird) do not update the message subject when it differs from the IMAP envelope and the body.
Consequently, subjects are not tagged in the email list, though they are tagged in the preview pane.
This is an IMAP client issue.
Note: Outlook 2000 is not affected by this problem.
