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Spam and Virus Filter HOWTO
Ordering and Configuring TZO Spam and Virus Filtering
To use TZO Spam and Virus Filtering service (SVF) you must own a registered domain name, be running your own email server already (examples: Exchange, MDaemon, etc.). You also need DNS service either at TZO or somewhere else, and have access to edit your DNS MX record.
When you add Spam and Virus Filtering to your Shopping Cart, during Checkout configuration answer Server Address SVF should send your email 'to'. Answer this question with the fully-qualified, Internet-routable hostname which resolves to your mailserver (example: exchange.example.com) or static IP address. This information does not publish into your MX record; it is configuration which is internal to the SVF service.
MX Record Configuration
TZO Spam and Virus Filtering service will require that your domain's MX record be set to the value: svf.tzo.com. If this domain's DNS is hosted by TZO, then as a convenience TZO will configure your MX record after Checkout completes.
If your domain's Authoritative DNS is not, then you must use that service provider's DNS management interface and manually configure your MX record. Please note, if your DNS provider uses an especially long cache (TTL) on MX records, it may require that amount of time before you can fully test the service (cache must expire).
Configuring Your Mailserver
In your mailserver, you must whitelist IP addresses 188.8.131.52 (Dallas SVF), and 184.108.40.206 (Boston SVF). The SVF servers must be exempt from any policy limits on maximum connections, spam, failed addresses or other limitations. Graylisting or Tarpitting will cause delayed or lost email.
If uncertain how to fully whitelist SVF in your software, contact Support for that application, and state that you are 'using an external (MX based) mail filtering service and you need to whitelist it'. The exact steps vary by server application and version, but are usually trivial.
NOTE: If you have additional network filtering in place, such as a SMTP filter or sophisticated firewall, you may need to make similar adjustments in those items.