Hi Michael,

> The direct emails can arrive long before the mailing list copy

I doubt procmail is up to the job.

I send one email with a message-ID field.

- You may have zero or more copies arrive with no list-ID field.
- You may have zero or more copies arrive with list-ID field X.
- You may have zero or more copies arrive with list-ID field Y.
- And so on depending how many distinct lists send you the same
  message-ID email.

You can get multiple copies from the same list, as I do, because of a
re-try after a transmission error.

All those emails may arrive in any order.

-- 
Cheers, Ralph.

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