[Dovecot] 1.0.13: mail_extra_groups alternative syntax?

[Dâniel Fraga]

"Warning: mail_extra_groups setting was often used insecurely so it is
now deprecated, use mail_access_groups or mail_privileged_group instead"

	I use the following:

mail_extra_groups = mail nogroup

	Because I have the real and virtual accounts.

	What's the correct way to replace the above line? It seems that
mail_privileged_group only accepts one group, but I need two.

	Any suggestion? Thank you!

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