Kerio MailServer 5

Kerio MailServer is an integrated cross platform e-mail server for Windows, Solaris, Mac OS X and Linux, targeted at small to medium businesses seeking a drop-in application to look after all of their e-mail services. Its major selling points are security, integration and cross-platform accessibility.


E-mail services: The e-mail server includes an SMTP server for delivery of e-mail. Retrieval of e-mail from the server can be performed using POP3, IMAP or Web mail. WAP is also supported, allowing users to access their e-mail using a GSM mobile phone. Directory services are provided by an ActiveDirectory server. Helpful backup, server monitoring and log analysis tools are included with the configuration client.

Antispam: You would expect some level of spam protection in an integrated product such as this. The antispam options focus on preventing common exploits of the mail server such as open-relays, and filtering incoming e-mail via external antispam lists such as MAPS. Significantly, the filtering options seem to be quite limited beyond the use of an external database. It would be nice if an intelligent filtering tool such as SpamAssassin ( had been included in order to reduce the dependence of Kerio MailServer on external antispam resources.

Antivirus: Multiple external virus scanners can be used to check incoming e-mail. A range of options is available for handling e-mails that fail the virus check. A version of Kerio MailServer bundled with McAfee Antivirus is also available.

Security: All protocols supported by the server can also be used in conjunction with SSL to provide secure, encrypted communications.

Installation: The version of Kerio MailServer that I reviewed included RPMs for Red Hat Linux 7.0 only. These are a bit dated, so I attempted to install the program on the latest version of Red Hat Linux, 8.0; to my pleasant surprise, it seemed to install without hassle. The server installed itself as a normal Linux service running under xinet.d and was ready for configuration immediately. After configuration, the server operated without a hitch.


The GUI configuration component is highly accessible. An external configuration client controls all components of the e-mail server, so you can configure a Kerio MailServer installed on a Linux server from your Windows desktop. All configuration performed over a network is encrypted using SSL. Kerio boasts that a system admini­strator should be able to configure Kerio MailServer in “about 15 minutes with minimal reference to the manual”. While this statement is designed to demonstrate the ease of configuring this program, I don’t think Kerio should encourage administrators to hurry the configuration of such a security conscious product.

Kerio MailServer is organised under domains, each containing users, otherwise known as e-mail accounts. The familiar representation of this organisation is the standard e-mail address format: user@domain. Users can be organised into groups, allowing the creation of mailing lists within a domain. Each domain can be configured individually. Other options such as backup, anti-spam and virus protection are globally configured and affect all domains administered on your system.

The configuration client is easy to use and finding the settings you wish to modify is a breeze. The range of options available for configuration is a bit basic, however. Areas such as antivirus and antispam, which are sold as major features of the product, seem a bit limited.


Kerio MailServer is a solid product. Hardcore system administrators may prefer the highly flexible configuration options available in other specialised e-mail servers such as Sendmail and Exim, but those looking for a single drop-in system would do well to consider Kerio MailServer. It would be encouraging to see future versions of this program available for distributions of Linux, in addition to Red Hat Linux.

Kerio MailServer is priced under a per-user licence system. A basic version with a 20-user licence is available for $US395 from the Web site ( A 30-day trial (including McAfee Antivirus) is also available for download from the site.

Join the newsletter!

Error: Please check your email address.
Rocket to Success - Your 10 Tips for Smarter ERP System Selection
Keep up with the latest tech news, reviews and previews by subscribing to the Good Gear Guide newsletter.

Alastair Cousins

PC World
Show Comments

Cool Tech

Breitling Superocean Heritage Chronographe 44

Learn more >

SanDisk MicroSDXC™ for Nintendo® Switch™

Learn more >

Toys for Boys

Family Friendly

Panasonic 4K UHD Blu-Ray Player and Full HD Recorder with Netflix - UBT1GL-K

Learn more >

Stocking Stuffer

Razer DeathAdder Expert Ergonomic Gaming Mouse

Learn more >

Christmas Gift Guide

Click for more ›

Most Popular Reviews

Latest Articles


PCW Evaluation Team

Edwina Hargreaves

WD My Cloud Home

I would recommend this device for families and small businesses who want one safe place to store all their important digital content and a way to easily share it with friends, family, business partners, or customers.

Walid Mikhael

Brother QL-820NWB Professional Label Printer

It’s easy to set up, it’s compact and quiet when printing and to top if off, the print quality is excellent. This is hands down the best printer I’ve used for printing labels.

Ben Ramsden

Sharp PN-40TC1 Huddle Board

Brainstorming, innovation, problem solving, and negotiation have all become much more productive and valuable if people can easily collaborate in real time with minimal friction.

Sarah Ieroianni

Brother QL-820NWB Professional Label Printer

The print quality also does not disappoint, it’s clear, bold, doesn’t smudge and the text is perfectly sized.

Ratchada Dunn

Sharp PN-40TC1 Huddle Board

The Huddle Board’s built in program; Sharp Touch Viewing software allows us to easily manipulate and edit our documents (jpegs and PDFs) all at the same time on the dashboard.

George Khoury

Sharp PN-40TC1 Huddle Board

The biggest perks for me would be that it comes with easy to use and comprehensive programs that make the collaboration process a whole lot more intuitive and organic

Featured Content

Product Launch Showcase

Latest Jobs

Don’t have an account? Sign up here

Don't have an account? Sign up now

Forgot password?