Configuring Message Rule Settings Parent topic

To set limits on the messages that IMSVA can handle and to control email relay, configure all settings on the Messages Rules screen.

Email Relay Parent topic

To prevent spammers from using the IMSVA MTA as a relay for spam, configure relay control by adding the mail domains on your network to the Incoming Message Settings list. When IMSVA receives a message, it looks at the final destination of the message and compares it to this list. IMSVA discards the message under the following circumstances:
  • The destination domain is not in this list
  • The parent domain of the destination domain is not in this list
  • The host is not on the Permitted Senders of Relayed Mail list
Incoming message settings are different from message delivery domain settings. For more information, see Configuring Message Delivery Settings.

Specifying Message Rules Parent topic

Procedure

  1. Go to Administration → IMSVA Configuration → SMTP Routing.
  2. Click the Message Rule tab.
    The Message Rule screen appears.
  3. Specify the Message Limits settings:
    • Maximum message size: Specify the number of megabytes.
    • Maximum number of recipients: Specify the number of recipients from 0 to 99999.
  4. Specify the Relay Control parameters to have IMSVA reject messages matching the selected condition.
  5. Specify the Incoming Message Settings.
    IMSVA relays the messages to the added domains.
    The following shows sample content of a domain list text file:
    • domain.com: Imports the exact domain
    • *.domain.com: Imports all sub-domains
    • domain.org: Imports the exact domain
    Note
    Note
    The import file must be a text file containing one domain per line. Optionally, use wildcards when specifying the domain.
  6. Specify the Permitted Senders of Relayed Mail.
    • Host only
    • Same subnet as the host
    • Same IP class as the host
    • Specified IP addresses
  7. Click Save.
    Tip
    Tip
    For security reasons, Trend Micro recommends avoiding open relay when configuring the message rule settings.