One simple way would be to remove the list from your purview completely and have the sysadmin maintain the list in an alias in your mail server.

However if you're determined to keep it under your control (not that that's a bad thing, just saying . . . :) you could use a YAML file (see also here) with a mapping of sequences (read hash of arrays) for the two cases.

In reply to Re: External Array of Emails by Fletch
in thread External Array of Emails by Anonymous Monk

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