Kemp LoadMaster is the undisputed King of Email Load Balancing
Updated April 13, 2021

Kemp LoadMaster is the undisputed King of Email Load Balancing

Anonymous | TrustRadius Reviewer
Score 10 out of 10
Vetted Review
Verified User

Overall Satisfaction with Kemp LoadMaster

Our Kemp LoadMasters are being used as a High Availability Active/Passive Clustered Pair to load balance all On-Premises inbound SMTP traffic and email access across multiple protocols (ActiveSync, Webmail, etc.).
It's used for the entire organization's email.
It addresses the business problems of:
1. Having a single point of failure for email ingress.
2. Providing a simple, robust load balancing and mail routing solution.
3. Guarantees performance as a dedicated load balancer separate from shared load balancer equipment used for other business segments like web and application.

After successfully upgrading from LM2400s to X3s and greatly leveraging Kemp Support throughout the process, with unique unforeseen issues that arose, Kemp Support very aggressively deployed their Support Experts to walk us through the cutover on multiple attempts until we were successful.
  • Provisioning of Virtual Services to Real IP'ed internal systems.
  • Detailed logging facilitating rapid and easy Root Cause Analysis of issues.
  • Extensive Online community resources and excellent customer support for issues.
  • Simple, effective and intuitive UI design.
  • Effortless manual failover/failback and upgrading procedures.
  • Provided meticulously detailed upgrade-in-place documentation for transitioning to new hardware
  • Pursued Root Cause possibilities of unforeseen upgrade issue/misconfiguration scenarios
  • Ability to 'clone' existing Virtual Services for rapid deployment of similar ones.
  • A better API for ease of automation.
  • Simplification of Certificate management.
  • Better explanations of Kemp implementations of industry standard protocols like VRRP (or CARP)
  • More control over device factory reset configuration and forcibly breaking HA pairs at boot time
  • It has drastically reduced time spent on mail chasing/delivery delay investigations.
  • It has greatly improved and modernized the mail flow evolution of our On Premise Email.
  • It has given the Infrastructure Team great flexibility and control over implementing different mail routing topologies for various segments of our business, particularly with Customer Communications and IT Development.
  • It has provided a robust, simpler & more affordable alternative to Netscaler or F5 for HA Load Balancing of critical internal & external business services
Although we use the two LBs in vastly different roles, the Kemp's architecture and interfaces are generally much easier and intuitive than the Netscaler's. Hardware/sw/fw upgrades and hardware migrations of the Kemps are much easier and straightforward. The Netscaler does excel in its online community and market share, but the Kemp's loyal following and devoted support staff make for a great customer experience.

Do you think Kemp LoadMaster delivers good value for the price?


Are you happy with Kemp LoadMaster's feature set?


Did Kemp LoadMaster live up to sales and marketing promises?


Did implementation of Kemp LoadMaster go as expected?


Would you buy Kemp LoadMaster again?


Microsoft Exchange, Microsoft Azure Active Directory, Barracuda Email Security Gateway, Dell EMC Avamar, VMware ESXi, Microsoft 365 (formerly Office 365), Opsview Monitor, MS SharePoint, Source by IC Thrive, SolarWinds Web Help Desk (WHD), Windows Server, CentOS Linux, PowerProtect DD (formerly Dell EMC Data Domain), PRTG Network Monitor, Microsoft Teams, Pulse Connect Secure (SSL-VPN), Aruba Networks Wireless LAN (WLAN), Aruba Instant On AP Series Access Points
Very well suited for On-Premises MS Exchange environments where uptime/availability and performance are crucial. Environments where high volume email, including mass-mailings are needed. Companies with limited or generalist Infrastructure team members with fundamental knowledge of the protocols, that need to be able to quickly implement and leverage an enterprise-class mail load balancing/routing solution without needing hours of learning curve time or training to do so effectively.
Well suited for Highly Available DNS (Windows/AD) provisioning, which we plan to use very soon in the future.

Configuring Kemp LoadMaster

I think for the types of Kemp products we've utilized, and the roles we needed them for, the configurability is just right. I don't recall ever wishing that a particular Virtual Service had any missing features or settings available that it didn't already have. One minor thing it could do better is update/make notification settings easier to find and use more modern methods besides just email alerting (SMS?).
Don't hesitate to open a proactive Support Case with them, they will provide you with updated documentation and advise on any gotchas in your environment.
Research KEMP's implementation for VRRP (CARP) if you are using HA, in respect to your own upstream core or edge switch vendors for known issues (we discovered one during our project!)
No - we have not done any customization to the interface
No - we have not done any custom code

Kemp LoadMaster Support

While needing to contact support for their product is rare, when we do it is always a pleasurable experience. Their Techs are USA-based, practical, very knowledgeable, detailed & responsive. The last time we needed their support the root cause actually ended up being unrelated to the Kemp LoadMaster itself, but an obscured downstream failure of our own equipment. The technician helped flush-out this issue via verbose logs and packet captures, explained why the Kemp was behaving as it was designed in this situation, suggested remediation tactics and still followed-up on his promise to keep the case open until we had implemented a solution to the downstream issue, and fully tested it with him afterward.
Quick Resolution
Good followup
Knowledgeable team
Problems get solved
Kept well informed
No escalation required
Immediate help available
Support understands my problem
Quick Initial Response
Support doesn't seem to care
Because our company depends on the LoadMaster as critical infrastructure hardware.
The previous time I contacted support their Tech helped identify (via Verbos logs and packet captures) the downstream issue (invalid certificate path) with our own different equipment, and went so far as to help remediate that issue and test afterward to insure our equipment was all working as expected. He followed-up with a recap of the issue and gave steps to avoid the issue from recurring.

Using Kemp LoadMaster

The full picture of easy, intelligent UI usability, robust performance & availability, simple service provisioning, detailed and useful performance metrics and logging, upgrade/maintenance ease, monitoring, online articles & active communities and excellent paid-support earn this product high marks. The simple fact that the uptime of this system is over 99.999% through its 7+ year deployment is testament to the product quality.
On the latest upgrade project from LM2400 to X3s I was able to get acquainted and leverage the X3's Console menu, including a factory reset as well as the CLI. Both performed relatively well with the exception of a 'stuck' HA configuration that was only remedied by cold booting (warm boot was not fixing it). Kemp Support, as expected, quickly harvested the logs after we worked through the issue so they could analyze the Root Cause in their labs since it was recognized as a possible emerging bug on their end.
Like to use
Relatively simple
Easy to use
Technical support not required
Well integrated
Quick to learn
Feel confident using
  • Hardware upgrade/Upgrade-in-Place preserving configs and certificates
  • VIP additions and monitoring
  • Out-of-box Setup
  • HA configuration in an Upgrade-in-Place scenario
  • Ability to change eth interface settings from console after HA configs applied

Relationship with Kemp Technologies

To put it bluntly, their support is perfect. Willingness to help, aggressiveness of problem resolution, attention to customer concerns, flexibility in staffing off-hours for maintenances, clear/frequent & timely communications and follow-ups, highly trained Engineers, forthright admission of product issues or limits, adherence to HA best-practices... the list goes on and on. Their support never fails to impress.