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To ensure delivery from FreeLists to email accounts you host or for inbound SMTP policies you have control over, you may want to add the outbound IPs in this list to your global allowlist(s).
This list, though relatively static, is subject to change at any time.
Allow/safe-list configurations are an anti-pattern but certain anti-spam services and devices have a reputation for questionable policies where a blanket trust of FreeLists is the easiest way to ensure reliable delivery.