I'm getting this report, while sending emails: ************* This is the mail system at host server.inagro.de. 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 <a.beyl@gematech-mbh.de>: host mx00.kundenserver.de[212.227.15.41] said: 550-Requested action not taken: mailbox unavailable 550 invalid DNS MX or A/AAAA resource record (in reply to MAIL FROM command) ************* What happened and how do I fix that?
