Spam emails are normally sent from mail servers that do not follow this protocol and are therefore filtered because they have not been resent. This technique relies on the email being sent from a proper mail server which follows set standards, and that server will then resend the email a short while later. Greylisting is a process whereby an email from an unknown source is rejected with a temporary error. Understanding how these methods work can help you to decide which anti-spam solution will be the most effective. If humans sometimes find it difficult to tell the difference between a spam and a legitimate email, how can a computer program accomplish this? There is a variety of techniques that anti-spam software uses to keep your Exchange server clean. However, this is not as easy as it sounds. You want an anti-spam solution that blocks all spam emails, while allowing legitimate email through. Given the wealth of options available, choosing which solution is best for your needs can be a challenge. Protecting your Exchange server infrastructure from email spam can be easier said than done. ![]() An In-depth Analysis of Anti-Spam Techniques to Protect Your Exchange Server
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