Try to change the source e-mail because some mail servers won't accept the default one. Check your network configuration (DNS, gateway) to make sure your SMTP server is reachable from the NAS. You may try to use IP address of the SMTP server instead of FQDN, to avoid any DNS issue.
Once e-mail notification is set, any warning or error event you see in System Log will generate an email alert.
Oké I will try this weekend. BUT:
- If the default e-mail account won't be accepted by the mail servers, what kind of e-mail adres should I use? My own one like firstname.lastname@example.org?
- And is there not an opportunity to 'ping' (or any other command) from the NAS to the e-mail server? (I will try IP adres of the smtp server of versatel.nl.)