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Dell SonicWALL Email Security Appliances are good. They work both appliance and virtualized.
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Dell SonicWALL Email Security Appliances are good. They work both appliance and virtualized.

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we plan to install an email gateway and we want to follow all ingree and egress mail traffic <br />
and we want to let it block automatically inbound and outbound spam emails<br />
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i am looking for your advices
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we plan to install an email gateway and we want to follow all ingree and egress mail traffic 
and we want to let it block automatically inbound and outbound spam emails

i am looking for your advices

Best Email gateway

Within Internet message handling services (MHS), a message transfer agent or mail transfer agent (MTA) or mail relay is software that transfers electronic mail messages from one computer to another using a client–server application architecture. A MTA implements both the client (sending) and server (receiving) portions of the Simple Mail Transfer Protocol (SMTP). The terms mail server, mail exchanger, and MX host may also refer to a computer performing the MTA function. The Domain Name System (DNS) associates a mail server to a domain with mail exchanger (MX) resource records containing the domain name of a host providing MTA services.

Email Servers

An email client, email reader or more formally mail user agent (MUA) is a computer program used to access and manage a user's email. A web application that provides message management, composition, and reception functions is sometimes also considered an email client, but more commonly referred to as webmail.

Email Software

Interactions between email servers and clients are governed by email protocols. The three most common email protocols are POP, IMAP and MAPI. Most email software operates under one of these (and many products support more than one).  The correct protocol must be selected, and correctly configured, if you want your email account to work.