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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[91.198.169.8] 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; mee@mydomain.no Arrival-Date: Sat, 1 Jul 2017 15:21:00 +0200 (CEST)

Final-Recipient: rfc822; mee@mydomain.no 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: mee@mydomain.no

Can anybody shed some light on this. I have been greylisted by Cyren, how? What has happened? How can I avoid this. Thanks!

  • Is this a mail server running on your local machine? – Cedon Jul 19 '17 at 11:14
  • Yes. wordpress running from a local machine. – oivind Jul 21 '17 at 7:29
  • A lot of mail servers will reject mail sent by localhost servers. This is an anti-spam protection. In order to get around this, you need a Fully Qualified Domain Name. If you can set it up to use a GMail account or something, then you can use that for testing. – Cedon Jul 21 '17 at 17:43
  • Okay, so I guess a Fully Qualified Domain Name will be overkill since its only me receiving test emails. So the solution you suggest is to use a gmail email address as the email wp is sending emails from? If that is the case, I have to tell you that I have previously also been graylisted from Cyren when using a gmail email. But since you are suggesting this as a solution, maybe I need to configure my gmail email in some manner? – oivind Jul 22 '17 at 10:43
  • I just used them as an example. You could use any provider like GMail, Outlook, etc. You might also contact Cyren and see what's up. – Cedon Jul 22 '17 at 15:45

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