site.edu
Here, the sender will receiver notification of the new address, and the recipient will receive
the original messages.
A problem can arise when spam messages are sent to a REDIRECT address. Because some
spam is sent with a fictitious envelope sender, the bounce caused by the REDIRECT will
itself bounce too. This creates what is called a double bounce (a bounce notification that
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17.8 Configuration File Feature Reference | 641
bounces). Double bounces are delivered to the address defined by the DoubleBounceAddress
option (?§24.9.44 on page 1025). If spam bounces of REDIRECT addresses start to annoy
you, consider redefining the DoubleBounceAddress option to deliver double bounce notification
to a less offensive address, suchas an address aliased to /dev/null. But be aware that
this will cause all double bounces to be sent to that address, not just spam double bounces.
17.8.46 FEATURE(relay_based_on_MX)
Relay based on MX records V8.9 and later
Ordinarily, the decision to relay is not based on MX records. Relaying based on MX
records poses a risk that outsiders might use your server as a relay for their site (that is, they
might set up an MX record pointing to your mail server, and you will relay mail addressed
to them without any prior arrangement).
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