Follow these steps when legitimate relays are getting rejected (For example, a customer is using smtp.wolfpack.net for Scans)
Step-by-step guide
- Log in to the Mimecast Admin portal
- Select Gateway -> Policies
- Select Anti Spoofing
- Select New Policy
- Fill out the policy as follows:
- Policy Narrative: Anti-Spoofing Bypass
- Select Option: Take No Action
- Email From:
- Address Based On: Both
- Applies From: Everyone
- Email To: Everyone
- Enable
- Set Policy As Perpetual: Always On
- Policy Override: Checked
- Bi Directional: Unchecked
- Add IP Addresses / Host names as needed
- Select Save and Exit.
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