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E-Mail: Mail Hi-Jacking FAQ
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The term "Mail Hi-Jacking" is used when a spammer sends out thousands of mails with a faked "sender".
Anyone can enter anything in the "sender" field.
There's no way that you can avoid that a spammer claims to be sending mails from your domain.
Spammers do this to escape filters set up by some of the major mail services on the net, like Hotmail.
These service have detectors that will notice if the same mail address is sending hundreds of mails in a limited amount of time.
Therefore, spammers are looking for domains that have a "catch-all" alias - that is, everything at that domain (eg. wxy77pq@example.com) will resolve as a valid email address.
The only way to avoid this is to remove the "catch-all" mail alias from the domain.
When you remove it, the mail filters won't be able to resolve the "sender" field to a valid address, and the mail will be blocked. Therefore, spammers will stop hi-jacking your domain as soon as the "catch-all" alias is removed.
Last update: 12.07.2009, 20:59 Author: EchoEcho Support
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