iCloud Mail Rule

What is the “has list-id containing” drop down option mean, how do I use it, and what does it do?

1 Answer 1


a unique identifier for a mailing list regardless of the particular host that serves as the list processor at any given time.


You can use this to perform an action for a specific mass email, such as a company's newsletter.

If you used the email address, that might change. list-id won't change.

You can find the list-id in the email header.

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