Qpsmtpd:random error

Qpsmtpd#Plugins

NAME

random_error

DESCRIPTION

This plugin randomly disconnects and issues DENYSOFTs.

CONFIG

one parameter is allowed, which is how often to error, as a percentage of messages. The default is 1. Use a negative number to disable.

2/5 of failures are DENYSOFT_DISCONNECT, 3/5 simply DENYSOFT.

For use with other plugins, scribble the revised failure rate to

   $self->connection->notes('random_fail_%');

calculating the probability of failure

There are six tests a message must pass to reach the queueing stage, and we wish to provide random failure for each one, with the combined probability being out configuration argument. So we want to solve this equation:

       (1-x) ** 6 = ( 1 - input_number )

or

       x = 1 - ( (1 - input_number ) ** (1/6) )

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