MX Verification Documentation

The MX verification mechanism is controlled by options set in the spasm configuration file: VerifyMX, VerifyMXExpire, VerifyMXExpireInterval, and VerifyMXMaxAttempts.

Setting the VerifyMXoption (path to the MX verification database) turns MX verification on. When a server sends an envelope sender address, spasm first searches the MX verification database for the hostname portion of the address.

Expired database entries are automatically removed at intervals defined by VerifyMXExpireInterval.

Unlike other callback verification mechanisms, spasm does not attempt to verify the full sender address. It only attempts to verify that a mail server responsible for the sender address's domain can be reached.