Kali,

Does HAProxy work with SMTP as well as HTTP? Although I have very limited knowledge about HAProxy, I could not find a way to provide HA for SMTP traffic. I only saw HTTP on their website.

In any case, the correct way to achieve HA in SMTP is through multiple MX records, not through a Proxy Server. The clustering page (http://www.xeams.com/clustering.htm) talks about this.

The web interface of Xeams is currently only available in English. However, it will be able to handle emails sent/received in other languages just fine.