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This is a simple autoresponder for qmail.
Mail is sent to help@my-company.com. An automatically generated response
is sent back to the user with an address of "help@my-company.com". You
can set the envelope sender to an empty string. However, some programs
will parse the message for the "From:" field and send an autoresponse
back to it. It is received at your autoresponder, and you now have a mail
loop.
This autoresponder also catches some other simple situations such as mail
from a mailer-daemon, empty envelope sender, bulk precedence headers, etc.
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