Delayed mail from using .countries.nerd.dk RBLs -
See article here
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Customer Setup
Step 1: Log in to SpamTitan
Step 2: Update your Security Settings
Step 3: Add your Domain(s)
Step 4: Test Connectivity to your Mail Server
Step 5: Editing A Domain Policy
Step 6: Change your MX Records
Step 7: Lock Down Your Mail Server
Locking Down Your Office 365 Mail Server
Changing MX Records on Common Mail Services
What is Recipient Verification?
Ensuring Your Email is Not Marked as Spam in Office 365