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If you use a Hosted Exchange or like service, they should filter for spam. <br />
If you use your own Exchange that you manage, you could use something like the Barracuda spam filter. You did need something on top of Exchange. <br />
If you are receiving email in a non-Exchange environment, you need a mail service that provides spam filtering like mail.com. I use mail.com<br />
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There are many, many ways to filter spam and no one solution fits all. The only thing I do not recommend is rolling your own because the problem has largely been solved commercially.
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If you use a Hosted Exchange or like service, they should filter for spam.
If you use your own Exchange that you manage, you could use something like the Barracuda spam filter. You did need something on top of Exchange.
If you are receiving email in a non-Exchange environment, you need a mail service that provides spam filtering like mail.com. I use mail.com

There are many, many ways to filter spam and no one solution fits all. The only thing I do not recommend is rolling your own because the problem has largely been solved commercially.

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Hi Experts, what would be the best software to use to fight spam email from a client side and server side. Thanks (sorry if the wording of the question is ambiguous)
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Hi Experts, what would be the best software to use to fight spam email from a client side and server side. Thanks (sorry if the wording of the question is ambiguous)

SPAM Email

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

An email client, email reader or more formally mail user agent (MUA) is a computer program in the category of groupware environments used to access and manage a user's email. A web application that provides message management, composition, and reception functions may internally act as an email client; as a whole, it is commonly referred to as webmail. Likewise, email client may be referred to a piece of computer hardware or software whose primary or most visible role is to work as an email client. Email clients can also have other systems, like calendars, notes and contact managers.

Email Clients

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

Exchange is the server side of a collaborative application product that is part of the Microsoft Server infrastructure. Exchange's major features include email, calendaring, contacts and tasks, support for mobile and web-based access to information, and support for data storage.