THE VIRTUAL SERVER HANDBOOK

Using the crontab command to manage the

relayers.db

Using your cron table, you can implement automatic address expiration. By

experimentation you can arrive at a workable policy that balances the

requirements of server security and the convenience of your users.

To implement a strict address expiration policy

From your cron table, enter

 */15 * * * * /usr/local/bin/vsmtprelay expire

60

(where every 15 minutes any addresses older than 60 minutes are

removed from the database)

Note:  The example above yields a 60 minute time window for SMTP

relay permission (with a granularity of 15 minutes).

To implement a lenient address expiration policy

From your cron table, enter

 0 0 * * * /usr/local/bin/vsmtprelay expire

(where 0 0 means that once a day at midnight, the address database is

completely cleared).

Note:  The example above enables your users to relay the entire day, if

they check their mail from that IP address at least once during the day.

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 1999  DIGITAL TOOLS  LLC.

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