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For maximum filtration quality, use Dr.Web SMTP proxy — a filter that processes email messages before they reach your mail server. When mail filtering is organised this way:
The cost of an SMTP proxy license is only 10% of the cost of a Dr.Web MSS license.
Dr.Web anti-spam is delivered as part of a single solution (not as a separate product) and is installed with a virus-filtering product on the same server. This simplifies administration and ensures that overall costs are lower than they would be if buying our competitors' solutions.
Product system requirements can be found in the documentation.