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@xxxxxxxxxxxxxxxxxxxxxxxxxx> wrote:
> On 2014-11-05, zep <zgreenfelder@xxxxxxxxx> 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@xxxxxxxxxxxxxxxxxxxxxxxxxx
>
>
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Iain Morris
iain.t.morris@xxxxxxxxx
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