monit alert mail message id issue

[Eric Pailleau]

Hello,

I encountered a monit alert mail issue.

I use simple config :

check file no_acks with path /path/to/no_acks.log
        if match ".*" then alert

So that monit effetively send a mail at each entry in this log.
So far so good.

But since we changed mail architecture, we did not received all the mails,
but, by investigating , only the first one of all in the same second (using monit.log timestamp reference)

We could find that imapd/cyrus  removed duplicate message ids and could add a special config entry disabling this option.

Indeed we could see in postfix/smtpd that all the mails was relayed, but all in the same second add same ID :
example :
Oct 18 15:32:41 sv1 postfix/cleanup[31715]: 9AE25A87C51: message-id=<1508333561.0@mydomain.net>
Oct 18 15:32:41 sv1 postfix/cleanup[31715]: A59FDA87C3D: message-id=<1508333561.0@mydomain.net>

It is not clear to me if this is a monit or postfix issue. Is this mail id set by monit or postfix ?

Thanks for sharing any thoughts on this.

Regards
Eric