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/usr/include/dovecot/mail-user-hash.h is in dovecot-dev 1:2.2.9-1ubuntu2.

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#ifndef MAIL_USER_HASH
#define MAIL_USER_HASH

/* Return a hash for username, based on given format. The format can use
   %n, %d and %u variables. */
unsigned int mail_user_hash(const char *username, const char *format);

#endif