Undelivered Mail Returned to Sender

[David G.]

Hello,

I get this message via the notification system at least once an hour.

Undelivered Mail Returned to Sender
This is the mail system at host pbs.wilke.local.
I'm sorry to have to inform you that your message could not
be delivered to one or more recipients. It's attached below.

For further assistance, please send mail to postmaster.

If you do so, please include this problem report. You can
delete your own text from the attached returned message.

               The mail system
Xxx@xxx.de: host mailin100.dcpserver.de[212.53.180.6] said: 550 Relay
not permitted (in reply to RCPT TO command)

I set up email briefly (I made a mistake in the password the first time). However, I deleted email and only activated webhook. Why do I always get the error message sent via the webhook?

GNU nano 7.2       /etc/proxmox-backup/notifications.cfg                 matcher: default-matcher
        comment Route everything but successful prune job notifications to>        disable true
        invert-match true
        match-field exact:type=prune
        match-severity info
        mode all
        target Iobroker

sendmail: mail-to-root
        comment Send mails to root@pam's email address
        disable true
        mailto-user root@pam

webhook: Iobroker
        body e3sgc2V2ZXJpdHkgfX0qKip7eyB0aXRsZSB9fSoqKnt7IG1lc3NhZ2UgfX0qK>        method post
        url http://192.168.99.33:8087/setValueFromBody/0_userdata.0.Notifi>
matcher: iobroker
        match-severity info,notice,warning,error,unknown
        mode all
        target Iobroker

 

[neoraptor]

Double check if your data store notification mode is set to "Notification system" and not "Email" (under your Datastore > Options).
I also had the same issue.
The default setting is probably set to email.