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- Spam prevention
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- All mail received by UTD-Hosting's mail servers is ran through several filters
- to help prevent spam. These filters should never affect any legitimate mail.
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- The checks performed on incoming mail reject messages from servers that do not
- identify themselves correctly when connecting. This stops around 45% of all
- spam messages sent to UTD-Hosting's servers. All legimate e-mail servers will
- identify themselves properly (and are required to do so by the protocol
- specifications).
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- The address of the remote server is then checked against four blacklists -
- sorbs, ordb, dsbl and spamhaus. These blacklists block known spammers and vulnerable machines
- which may be used to relay spam. Again, legitimate e-mail servers rearely find
- their way on to spam blacklists (and when they do, there's a simple de-listing
- process), so legitimate mail shouldn't be stopped.
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- In a sample of mail received over twenty four hours, these processes stopped 86% of spam mail, with 0 false positives.
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