Bouncing emails (Group doesn't exist: vmail)

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This is what i get :

/etc/dovecot/dovecot.conf:70:    user = vmail
/etc/dovecot/dovecot.conf:76:  user = vmail
/etc/dovecot/dovecot.conf:113:    user = vmail
/etc/dovecot/dovecot.conf:118:    user = vmail