This is the error email I receive after wp is sending an email:
This is the mail system at host mees-MacBook-Pro.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
: host mxcluster1.one.com[184.108.40.206] said: 450 4.7.1 Recipient address rejected: xx.xxx.xx.xxx temporary greylisted by CYREN IP reputation (in reply to RCPT TO command) Reporting-MTA: dns; mees-MacBook-Pro.local X-Postfix-Queue-ID: 18F8945ABC66 X-Postfix-Sender: rfc822; firstname.lastname@example.org Arrival-Date: Sat, 1 Jul 2017 15:21:00 +0200 (CEST)
Final-Recipient: rfc822; email@example.com Action: failed Status: 4.7.1 Remote-MTA: dns; mxcluster1.one.com Diagnostic-Code: smtp; 450 4.7.1 Recipient address rejected: xx.xxx.xx.xxx temporary greylisted by CYREN IP reputation
Fra: customer Terrassehus Emne: [Sameiet customer Terrassehus] Ny kundeordre (3496) - 1. juli 2017 Dato: 1. juli 2017 kl. 15.21.00 CEST Til: firstname.lastname@example.org
Can anybody shed some light on this. I have been greylisted by Cyren, how? What has happened? How can I avoid this. Thanks!