Bounce Spam

• The best practice is for the mail system administrator to program his mxs to reject the mail at the time of the delivery attempt, rather than to pass it on to an mda to be bounced.
• Typically, the check bounces once the victim has sent the money.
• The term "blowback" describes various kinds of automatically-generated e-mail messages, including vacation messages, challenge-response notifications, MDA bounces, and other "autoresponder" mails.
• Since the MDA can't "reject" the mail since it's already been accepted by the MX, the best it can do is to send a bounce message back to the return-path address indicating that the mail is undeliverable.
• A spammer can make hundreds or thousands of bounces for messages that will be sent back to the catchall address.
• For example, if a spammer decides to forge non-existent addresses in the domain into his messages, then hundreds or thousands of bounces for all of these messages will be sent back to the victim's catchall address.
• Third, it can cause bounces and complaints to be directed to the innocent third party.
• The term "blowback" describes various kinds of automatically-generated e-mail messages, including vacation messages, challenge-response notifications, mda bounces, and other "autoresponder" mails.
• Right now, unfortunately, spf isn't in widespread-enough use to be viable as a spam-detection tool though it is beneficial in preventing bounces to innocent mail users whose addresses have been forged into the spam.
• Secondary spam created by poorly-implemented email software which reports bounces back to the address in the "from:" line of spam.
• Since the "from:" line is invariably forged, this can cause a second wave of spam in which an innocent third party to receive thousands of bounces.
• The innocent party can also suffer from a flood of email bounces caused by the spam campaign.
• A message bounce is when a mail delivery agent notifies the sender of an e-mail message using the return-path address of the message, that the message cannot be delivered because its for-address is not valid, or is incapable of receiving the mail.

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