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GFI MailEssentials for Exchange/SMTPScreenshot 

 

GFI MailEssentials is a server based anti-spam and anti-phishing solution for Exchange/SMTP/Lotus, which also includes freeware features. With GFI MailEssentials you can add disclaimers to the top or bottom of emails at server level for FREE. This solution uses multiple anti-spam filtering techniques to capture 99% of spam, whilst minimizing false positives. Spam is caught before reaching the mail server, eliminating the need for client software!

Screenshot of GFI MailEssentials for Exchange/SMTP