Swatchdog Mail not working


I want to send mails via swatchdog if a error or Intrusion Protection Log appears…

I already set up the Mail-Service and get mails…
Swatchdog is also set up and I get messages out of it

But when swatchdog wants to send mails I get the following (xyz-server was changed)

remote delivery to xyz-server (was changed) failed after RCPT TO: 550-Verification failed for root@ipfire.local^M 550-The mail server does not recognize root@ipfire.local as a valid sender.^M 550 Sender verify failed

What do I need to change so that its authenticated the right way?