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How to restrict Dovecot's passwd userdb driver to only mail users

th flag

I am using Dovecot's passwd userdb driver, like this.

userdb {
    driver = passwd
}

This works fine, but it seems to allow all users in /etc/passwd to receive mail, including root, which I do not want. Is there any way to restrict this to only users belonging in the mail group, or do I need to use another driver?

mangohost

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