Around two years ago the Axigen Mail Server began the Cluster Support Era with the final touches being added to the SMTP, POP3, IMAP and Webmail proxy services. Back in the day, our main concern was the Red Hat Clustering Suite included in the RHEL5 Linux distribution, developed and maintained by Red Hat, because it was (and still is) one of the most widespread clustering solutions, and also has a free of charge alternative built into CentOS.
However, now that the product has evolved and the product's exposure to the market has grown considerably, a variety of clustering alternatives have to be supported to meet the demands and requirements of our customers. The year 2009 was very productive from the clustering integration standpoint, as the team had amassed quite a lot of knowledge of incalculable value.