help.txt

                        MAIL SIMULATOR

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 This is a mail simulator. It will not relay mail anywhere, 
 but it can generate useful responses for common non-delivery
 scenarios.
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 Here are some example usages:

 Produce a immediate soft bounce for this address (450)
    
    `anything+transient-bounce@[[base_domain]]`

 Produce an immediate hard bounce for this address (550)

    `anything+hard-bounce@[[base_domain]]`

 Produce an immediate bounce with the specified enhanced code (x.y.z):

    `anything!extended_code=x.y.z@[[base_domain]]`

 Additional supported commands are:

    !base_code=XXX
    !bounce_until=timestamp (must be a unix utc timestamp - in seconds)

 Multiple commands may be included in the address like so:

    `anything!extended_code=4.3.1!base_code=454!bounce_until=177327837@...`

 Valid extended codes can be found in RFC 3463.
 https://tools.ietf.org/html/rfc3463

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