Multiple ALT mail_location possible?

[Ralf Hildebrandt]

http://wiki2.dovecot.org/MailboxFormat/dbox#Alternate_storage
lists
mail_location = mdbox:/var/vmail/%d/%n:ALT=/altstorage/vmail/%d/%n


But can I have multiple ALT= locations? Background: I want to migrate
to a hashing-scheme!

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