Re: monit 5.4 violating smtp protocol

[Igor Homyakov]

Hi Len

Accordingto postscreen documentation :

postscreen(8) should not be used on SMTP ports that receive mail from
end-user clients (MUAs)

monit is not a SMTP server or MTA in any cases. It is MUA exactly.

>From my point of view you should reconfigure your monit daemons to use
submission SMTP port (with auth) for alert delivery.

Kind regards
Igor Homyakov


On Thu, Aug 23, 2012 at 5:18 PM, Len Conrad <address@hidden> wrote:
>
>
> ---------- Original Message ----------------------------------
> From:  "Len Conrad " <address@hidden>
> Reply-To:  <address@hidden>
> Date:  Wed, 22 Aug 2012 16:34:22 +0200
>
>
> I have several monit 5.4 with their mailserver set to mx1.domain.com
>
> mx1 runs postfix's postscreen and is dropping the monit smtp clients with
>
> "PREGREET 20 after 0"
>
> that's "after 0 seconds", meaning monit smtp client is connecting to port 23 
> and immediately starts sending, when it should wait for mx1's SMTP greeting.
>
> That's why the log line is a PREGREET violation.
>
> The "20" means mx1 received 20 characters before mx1 could send its SMTP 
> greeting.
>
> As a result, we aren't getting monit alerts and will have to whitelist all 
> the monit IPs so the pregreet filter doesn't drop them.
>
> Len
>
>
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