Mail to "firstname.lastname@example.org": Undelivered Mail Returned to Sender
Wrote a mail to "email@example.com" and got this reponse:
This is the mail system at host allmenda.net.
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
Reporting-MTA: dns; allmenda.net X-Postfix-Queue-ID: 1845E74EE4 X-Postfix-Sender: rfc822; firstname.lastname@example.org Arrival-Date: Thu, 13 Jun 2019 10:15:00 +0200 (CEST)
Final-Recipient: rfc822; email@example.com Original-Recipient: rfc822;firstname.lastname@example.org Action: failed Status: 5.5.1 Remote-MTA: dns; mail.linuxit.at Diagnostic-Code: smtp; 550 5.5.1 email@example.com... rejected by SPF