I like exim for this purpose. I used to run a number of high performance clusters and some of the nodes needed to send status information via e-mail. Exim was just right for me. It is also pretty easy to configure. http://www.exim.org/ Geoff Galitz Blankenheim NRW, Deutschland http://www.galitz.org -----Original Message----- From: centos-bounces at centos.org [mailto:centos-bounces at centos.org] On Behalf Of Brett Serkez Sent: Montag, 18. August 2008 22:00 To: CentOS mailing list Subject: [CentOS] Lightweight MTA for XEN CentOS guests All, For a production environment, I'd like to setup CentOS XEN guests as lightweight as possible. I'd like the XEN guests to be able to send nightly email as all CentOS servers do, but there is no reason to run a mail server as the CentOS Dom0 already has an email server running that can act as an email smart host. ....