To trust-list our phishing and training-related emails when using Message Labs, you should add our IP addresses to a global Approved Senders list. This will allow our phishing and training-related emails through. 

To Add an approved Sender

1. Select Services > Email Services > Anti-Spam.
2. Ensure that Global Settings is selected in the domains drop-down list.
3. Click the Approved Senders tab.
4. Click the Add Entry option.
5. The Domain/Email/IP and Description fields become editable.
6. In the Domain/Email/IP field enter the IP address: 204.220.164.253.
7. In the Description field, add a short description for this Entry
8. To add the entry to the list, click Update.