Free Protection Against Spam For Your Mail Server

MailWasher Enterprise Server (MWES) is a robust and extremely effective, server-side spam filter which is flexible enough to handle the needs of small businesses through to very large businesses and ISP's.

MWES stops spam instantly while offering a polished, well-integrated web interface and built-in quarantine management facilities. It is simple for administrators to set up and manage and easy for users to use on a day-to-day basis.

MWES is free to use and will filter spam forever, but after 30 days the dashboard, search and reporting capabilites are disabled unless a license is purchased.

Compatible with any mail server on Windows or Linux, MWES is very versatile and easy to install.

When you use MailWasher Server, the benefits become obvious.

  • Maintenance free running with instant spam protection using real-time updates and learning features
  • Lightweight/high performance and significantly reduces the load on your mail server with it's proxy design.
  • Quick installation in 10 minutes with clear instructions, or we can install it for you.
  • Easy for end users and administrators with its simple user interface.
MWES Diagram
    Compatible with:
  • Windows: Use any Windows mail server (Microsoft Exchange 2000, 2003, 2007, 2010, 2013, SmarterMail, IMail, Communigate Pro etc.
  • Linux: Any MTA such as Sendmail, Postfix, QMail, Exim etc.

I've tested a decent number of anti-spam gateway products in the past, and honestly I just haven't been satisfied with them. They are either inaccurate, hard to use, hard to set up, or worse. Thanks for making this great product available.

John S

...on my test mail server it appears that MWES places an extremely low load on the server. It really is quite impressive what you have achieved with it.

Chris H

Quarantine screen

Block spam before it gets to the server

MailWasher Enterprise Server works as a proxy, so it sits in front of your mail server blocking and denying spam from getting to your mail server and users. Ultimately your mail server will have less work to do because it's only receiving legitimate email.

With its easy to use web interface, MWES is simple to setup and use for administrators and users.

Since MWES sits in front of your mail server and has extremely low system resource usage, no extra hardware is required and emails never leave your network. It only takes around 10 minutes to install and configure, or just ask us and we'll do it for you.


Let your users manage their quarantined email

With spam quarantine facilities, users can be sent a daily (configurable) digest of quarantined email and rescue blocked messages from within the digest email. Users can also quickly search, view and unblock any email via their browser.

Alternatively, the header of the email can be marked, delivered and then filtered by the end users email client.

A digest email
MWES spam tools

Intelligent spam tools

Advanced spam detection technology and tools do all the hard work for you by automatically quarantining spam emails.

From a simple whitelist (IP or email), blacklists (IP or email), greylisting, bayesian filters, real-time spam signature updates, RBL's, Trusted IP's to advanced custom filters, MailWasher has you covered.

spam tools

Comprehensive administration tools

MWES reports daily statistics of how much email is being blocked and by what spam tool. The Email screen lets you further drill down and find why an email was blocked.

Other administration tools let you auto generate user accounts for end-users to view their blocked spam, send rejection notices, let users access spam digests for other aliases and report spam.

MWES Dashboard screen

Quick Answers to Common Questions

Which mail servers and operating systems does MWES work with?

  • Windows: Use any Windows mail server (Microsoft Exchange 2000, 2003, 2007, 2010, 2013, SmarterMail, IMail, Communigate Pro etc.
  • Linux: Any MTA such as Sendmail, Postfix, QMail, Exim etc.
  • How does MWES work?

    MWES works as a proxy, meaning it sits in front of your mail server collecting and processing all incoming mail. You will notice a significant reduction spam along with reduced load on your mail server when MWES is installed and working.

    Since MWES sits in front of your mail server listening for email on SMTP port 25, it then passes any good email on to your mail server on Port 26. You will need to configure your mail server to listen for email on Port 26.

    MWES will then quarantine any incoming spam where it can be viewed/rescued conveniently in your web browser.

    See more info

    What is the performance and spam catch rate like?

    MWES is muti-threaded, so it takes advantage of multi-core processors. Running on Linux with 2 core cpu, 2 GB Memory, 150GB HD, easily processes 4000 emails per minute. See recommended/minimum specs

    What are best practices for blocking spam?

    You should see spam blocking rates of over 99%, especially as MWES adapts to the spam you receive.

    Out of the box MWES should block around 95% of spam

    To increase this and filter the remaining spam read these steps
    1.You may want to add common spam domains or FROM email addresses using wildcard patterns to the blacklist. These will become apparent over time. eg domains like *@*.ninja
    2. You'll want to enable Bayesian Filtering. This type of filtering learns from emails you decide are good and bad and is the last filter to be used. It will mop up almost all remaining spam.

    There's not too many reasons to use the Whitelist unless you're having issues receiving email from a user or domain. ie. Their server doesn't support Greylisting, or they've been added to external blacklists.

    Can you tell me more about each filtering mechanism?

    The Frequently Asked Questions have a summary of each filtering mechanism and the order of filtering

    What is greylisting?

    Greylisting is an effective tool to stop spam by sending a temporary fail back to the sender of the message. If the sender is sent via a valid MTA, the message is re-sent and MWES will let it through. If the message is not sent from a valid MTA it is not delivered and left in the MWES greylisting quarantine area. If a company has a valid SPF record, then email from that company will bypass greylisting.

    Greylisting and SPF are enabled by default in Settings>>General

    How can I setup daily/hourly blocked spam digests for my end users?

    The user guide has comprehensive instructions on setting up digests for end-users.

    Can I make further changes to the configuration not listed?

    Yes, you can make some more fine grained changes by altering options in the config file (Linux) or Registry (Windows). See details on further configuration options.

    Where can I learn about the latest features?

    You'll find these in the Version history page.

    I have a specific question not answered here

    First check out the Support Page, or send our friendly support team an email with your question.

    How much does MWES cost?

    MWES is free to use and won't expire. MWES is fully featured for the first 30 days and will continue to filter spam after 30 days, but Dashboard, Search and Reporting tools are disabled until a license is purchased. MWES costs $449 for unlimited users and domains ($199 for under 10 users). Please see the buy page

    ...this is an awesome spam filtering system and well worth every penny.


    ...This excellent software makes using the Internet and email productive again. Simple to use and set-up, yet incredibly powerful in its application. I'm happy to recommend this product to anyone that doesn't want to waste time with spam.

    Bob Partridge -

    ...I was delighted that Mail Washer "did what it said on the can"!!!


    We're becoming some of your biggest fans over here - MailWasher Server is a great product.

    Jim S

    Software Information

    Version Information

    Current Version:
    File Size: 5 MB
    Operating System: Works with Windows and Linux
    Release Date: 2 March 2016
    Protection Against: Spam, phishing emails.
    Trial Limitations: The trial offers 30 days free and full functionality. MWES will continue to filter spam after the 30 day trial but Dashboard, Search and Reporting features will be disabled unless a license is purchased.
    License: License to install on 1 server. Includes 1 years use of all new versions, updates, real-time spam blocking and customer support. License costs $449 for unlimited users and domains. ($199 for under 10 users)