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/usr/include/dovecot/userdb-vpopmail.h is in dovecot-dev 1:2.2.9-1ubuntu2.

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#ifndef USERDB_VPOPMAIL_H
#define USERDB_VPOPMAIL_H

#include <stdio.h>
#include <vpopmail.h>
#include <vauth.h>

/* Limit user and domain to 80 chars each (+1 for \0). I wouldn't recommend
   raising this limit at least much, vpopmail is full of potential buffer
   overflows. */
#define VPOPMAIL_LIMIT 81

struct vqpasswd *vpopmail_lookup_vqp(struct auth_request *request,
				     char vpop_user[VPOPMAIL_LIMIT],
				     char vpop_domain[VPOPMAIL_LIMIT]);

#endif