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-if its already in your inbox, any antivirus with antispam filtering would work. <br />
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If you want to screen incoming mails from getting to your exchange inbox try xwall. it runs at port 25 receiving your incoming mail, checks the messages against several spam databases and redirects/discards spam based on your settings.<br />
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also, check your SPF rules for your mail server on your hosting DNS service, it can work to reduce spam somewhat.
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-if its already in your inbox, any antivirus with antispam filtering would work.

If you want to screen incoming mails from getting to your exchange inbox try xwall. it runs at port 25 receiving your incoming mail, checks the messages against several spam databases and redirects/discards spam based on your settings.

also, check your SPF rules for your mail server on your hosting DNS service, it can work to reduce spam somewhat.

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also, check your SPF rules for your mail server on your hosting DNS service, it can work to reduce spam somewhat. 
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<br />
Just to clear this up -- SPF records for your domain are not related to spam incoming to your domain. &nbsp;However, on that note, if you enable SPF verification (for other domains) on your incoming server, that will reduce spam. &nbsp;I also suggest verifying DKIM signatures.
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> also, check your SPF rules for your mail server on your hosting DNS service, it can work to reduce spam somewhat.


Just to clear this up -- SPF records for your domain are not related to spam incoming to your domain.  However, on that note, if you enable SPF verification (for other domains) on your incoming server, that will reduce spam.  I also suggest verifying DKIM signatures.

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I have a list of emails (100k) that I need to clean up, what is the best bulk email verifyer?
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I have a list of emails (100k) that I need to clean up, what is the best bulk email verifyer?

best bulk email verifyer program or solution

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.

Exchange

Software is any set of instructions that directs a computer to perform specific tasks or operations. Computer software consists of programs, libraries and related non-executable data (such as documentation). Computer software is non-tangible, contrasted with computer hardware, which is the physical component of computers. Software written in a machine language is known as "machine code". However, in practice, software is usually written in high-level programming languages than machine language. High-level languages are translated into machine language using a compiler or interpreter or a combination of the two.

Software

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.