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Any mail server restricts the capabilities of the anti-virus that is installed on it. For example, the widespread MS Exchange mail server transmits for analysis only parts of an email, not the whole thing, which significantly complicates the analysis, including the analysis for spam. For increased effectiveness, it is strongly recommended that mail traffic filtering be transferred to a separate server that is independently capable of receiving and transmitting email messages. This simultaneously improves the quality of scanning and (in some cases) reduces the cost of licensing the mail server. For this purpose, an additional Dr.Web component—SMTP Proxy, which is the part of Dr.Web Mail Security Suite—should be used. This component extends the product’s features, e.g., it allows source addresses to be checked and system user authorization and many other features to be employed.