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The module is loaded, when the configuration file contains section [mod_delay].
The more time spammers sent in waiting, the less amount of spam they send. mod_delay ensures that the SMPT server spends a minimum amount of time in each phase during the delivery.
ehlo the minimum amount of seconds that the client will wait for an answer of EHLO
mail the minimum amount of seconds that the client will wait for an answer of MAIL FROM:
rcpt the minimum amount of seconds that the client will wait for an answer of RCPT TO:
data the minimum amount of seconds that the client will wait for an answer of end-of-data-fullstop.
If another module needs more time for a phase, than mandated by mod_delay, then mod_delay does not impose additional delays.