yes. I keep email on, just disable authentication so that emails don't actually go out. The Test button should work to test the discord notification at this point.

Thanks for the script! Seems to work well. I hit "Test" in openmediavault ad I get the message in Discord almost instantly. However, I don't get any of the regular system messages from openmediavault (all messages are received by email just fine). What could be blocking this?

If you want to show the output of a file or stdin in bash, and your file includes special characters such as backticks (`) and ", then you can't simply cat filename. You will need to properly escape special characters.

One of the easiest methods to output properly escaped text from a file is to use jq, cut, and rev

Prerequisites

[jq](https://stedolan.github.io/jq/) - Character escaping
[cut](https://linux.die.net/man/1/cut) - Cut characters from string (part of [coreutils](https://www.gnu.org/software/coreutils/coreutils.html), included by default on most systems)
[rev](https://linux.die.net/man/1/rev) - Reversing of characters (part of [util-linux](https://en.wikipedia.org/wiki/Util-linux), included by default on most systems)

Usage:
Simply pass filename to the following command to escape the file contents to stdout:

jq -Rs . <filename | cut -c 2- | rev | cut -c 2- | rev

So, instead of

$(cat ${OMV_NOTIFICATION_MESSAGE_FILE})

use this

$(jq -Rs . <${OMV_NOTIFICATION_MESSAGE_FILE} | cut -c 2- | rev | cut -c 2- | rev)

So the working bash script to put in /usr/share/openmediavault/notification/sink.d/20discord is here:

#!/bin/bash
DISCORD_WEBHOOK='PUT YOUR WEBHOOK LINK HERE'

generate_post_data() {
  cat <<EOF
{
  "content": "",
  "embeds": [{
    "title": "${OMV_NOTIFICATION_SUBJECT}",
    "description": "$(jq -Rs . <${OMV_NOTIFICATION_MESSAGE_FILE} | cut -c 2- | rev | cut -c 2- | rev)",
    "color": "45973",
    "footer": {
        "text": "${OMV_NOTIFICATION_DATE}",
        "icon_url": ""
    }
  }]
}
EOF
}

curl -H "Content-Type: application/json" -X POST -d "$(generate_post_data)" $DISCORD_WEBHOOK

@beppefiocco Tysm, your solution worked great.