General-Purpose Mail Filter
mailfromd functions use DBM databases to save their
persistent state data. Each database has a unique identifier,
and is assigned several pieces of information for its maintenance: the
database file name and the expiration period, i.e. the
time after which a record is considered expired.
To obtain the list of available databases along with their preconfigured settings, run mailfromd --show-defaults. You will see an output similar to this:
version: 8.7 script file: /etc/mailfromd.mf preprocessor: /usr/bin/m4 -s user: mail statedir: /var/run/mailfromd socket: unix:/var/run/mailfromd/mailfrom pidfile: /var/run/mailfromd/mailfromd.pid default syslog: blocking supported databases: gdbm, bdb default database type: bdb optional features: GeoIP greylist database: /var/run/mailfromd/greylist.db greylist expiration: 86400 tbf database: /var/run/mailfromd/tbf.db tbf expiration: 86400 rate database: /var/run/mailfromd/rates.db rate expiration: 86400 cache database: /var/run/mailfromd/mailfromd.db cache positive expiration: 86400 cache negative expiration: 43200
The text below ‘optional features’ line describes the available built-in databases. Notice that the ‘cache’ database, in contrast to the rest of databases, has two expiration periods associated with it. This is explained in the next subsection.
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