user.db

    Alias:

        KEY: user@domainA
      VALUE: forward \0 forward \0 forward \0 forward \0

    User:

        KEY: user@domainU
      VALUE: password \0 uid \0 gid \0 dir \0 quota \0

    Spam:

        KEY: user@domainS
      VALUE: email_id

    Virus:

        KEY: user@domainV
      VALUE: email_id

spam.db

        KEY: email_id
      VALUE: rule \0 value \0 rule \0 value \0
