Cron <root@fw> periodic daily/weekly/monthly

[kingfisher77]

Hi, i feel a bit stupid because i cannot find out where these mails are coming from:

From root@fw  Mon Aug  3 03:01:43 2020
Return-Path: <root@fw>
X-Original-To: root
Delivered-To: root@fw
Received: by fw (Postfix, from userid 0)
        id A5FD9D9FB03; Mon,  3 Aug 2020 03:01:43 +0200 (CEST)
From: Cron Daemon <root@fw>
To: root@fw
Subject: Cron <root@fw> periodic daily
X-Cron-Env: <SHELL=/bin/sh>
X-Cron-Env: <PATH=/etc:/bin:/sbin:/usr/bin:/usr/sbin>
X-Cron-Env: <HOME=/root>
X-Cron-Env: <LOGNAME=root>
X-Cron-Env: <USER=root>
Message-Id: <20200803010143.A5FD9D9FB03@fw>
Date: Mon,  3 Aug 2020 03:01:00 +0200 (CEST)
Status: RO

mail: illegal option -- E
Usage: mail [-iInv] [-s subject] [-c cc-addr] [-b bcc-addr] to-addr ...
            [- sendmail-options ...]
       mail [-iInNv] -f [name]
       mail [-iInNv] [-u user]

Sometime i fiddeled around with Cron jobs sending mail. Then it worked but later i found out that this mails aggregate over time for periodic daily/weekly/monthly.

I think i read all documentations and posts about Cron jobs in OpnSense but damn it i cannot change the behaviour. Would anyone like to find the mistake with me? I really appreciate this.