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Sami Farin proposed an Anti-Bogus Bounce System in 2003 in news.admin.net-abuse.email, [1] which used the same basic idea of putting a hard to forge hash in a message's bounce address. In late 2004, Goodman et al. proposed a much more complex "Signed Envelope Sender" [ 2 ] that included a hash of the message body and was intended to address a ...
Callback verification, also known as callout verification or Sender Address Verification, is a technique used by SMTP software in order to validate e-mail addresses. The most common target of verification is the sender address from the message envelope (the address specified during the SMTP dialogue as " MAIL FROM ").
If you get a message that seems like it's from AOL, but it doesn't have those 2 indicators, and it isn't alternatively marked as AOL Certified Mail, it might be a fake email. Make sure you immediately mark it as spam and don't click on any links in the email.
Greylisting is effective against mass email tools used by spammers that do not queue and reattempt mail delivery as a regular mail transport agent normally does. Delaying delivery also gives real-time blackhole lists and similar lists the time to identify and flag the spam source.
AOL may send you emails from time to time about products or features we think you'd be interested in. If you're ever concerned about the legitimacy of these emails, just check to see if there's a green "AOL Certified Mail" icon beside the sender name. When you open the email, you'll also see the Certified Mail banner above the message details.
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