Multiple email message filing rule hits

I'm using FastMail & have a reseller account with which I hope to use one day to manage clients' email accounts.

Each account will have 1 Inbox & will allow the creation of multiple aliases on their domain, all of which get delivered to the single inbox.

FastMail has a rule-based filing system which will route messages addresses to an alias to a specific folder created to hold messages sent to each alias. However it's not possible to duplicate and copy messages sent to multiple aliases to all the folders associated with each alias, just the first rule will apply.

In this example, "Rule 3" will not work.

Example:

Account: [email protected]

Alias0: [email protected]

Alias1: [email protected]

Alias2: [email protected]

Rule0: Messages addressed to "[email protected]" go to folder "Accounts0"

Rule1: Messages addressed to "[email protected]" go to folder "Accounts1"

Rule2: Messages addressed to "[email protected]" go to folder "Accounts2"

Rule3: Messages addressed to "[email protected]" AND "[email protected]" AND "[email protected]" go to folders "Accounts0" AND "Accounts1" AND "Accounts2"

Can anyone suggest a way to make this work? Possibly creating a tiny linux VPS to monitor all the addresses & copy multiple recipients to their correlating destination folders?

Thanks, -me

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