How to resolve blocks by Apple Mail (local policy).
Apple Mail domains
icloud.com and me.com are domain names owned and operated by Apple.
Blocked email message
Sometimes, Apple Mail blocks your Mailing List email with this error message:
550 5.7.1 [CS01] Message rejected due to local policy.
Please visit https://support.apple.com/en-us/HT204137
How do I resolve this issue?
Add a Rule in Mail > Preferences to allow/whitelist mail from mail-list.com.