For some fast and free monitoring along with DNS verification/blacklist/config checks of your MX records, MXToolbox lets you monitor one domain for free. Nice to have an external, independent source checking your public MTA. Nagios is still what I would choose for minute-by-minute checks but MXToolbox is free, and isn't tied to your infrastructure in any way. On Wed, Nov 5, 2014 at 12:34 PM, Keith Keller <kkeller at wombat.san-francisco.ca.us> wrote: > On 2014-11-05, zep <zgreenfelder at gmail.com> wrote: >> >> I'd second nagios, but I think to -really- test smtp, you'd need an >> external email source, a specialized target user and cron on both sides >> (at least that'd how I'd do it, just to be sure mail is really flowing >> through). > > For just testing whether the SMTP server is up (which is what the OP > originally requested) a nagios check may be sufficient. As another > poster mentioned, he could use the check_smtp plugin (e.g., via cron, > though I agree with you that cron isn't a great tool for monitoring) > without running a full Nagios server. > > For verifying that delivery is occuring successfully, you'd need more > what you described, but even that's not going to be foolproof: maybe > delivery to you is working fine, but delivery to other users isn't > working properly. It's really up to the OP, how much work does he > really want to put in? > > --keith > > -- > kkeller at wombat.san-francisco.ca.us > > > _______________________________________________ > CentOS mailing list > CentOS at centos.org > http://lists.centos.org/mailman/listinfo/centos -- -- - Iain Morris iain.t.morris at gmail.com