Instagram/Facebook HELO/SPF fail

I am trying to get an email from instagram, but I wasn’t receiving it. Upon checking my mail logs I see the following log message. Sep 13 03:50:51 mailserver postfix/smtpd[28105]: NOQUEUE: reject: RCPT from 66-220-155-156.mail-mail.facebook.com[66.220.155.156]: 550 5.7.1 <[email protected]>: Recipient address rejected: Message rejected due to: domain owner discourages use of this host. Please see http://www.openspf.net/Why?s=helo;id=mx-out.facebook.com;ip=66.220.155.156;[email protected]; from=<[email protected]> to=<[email protected]> proto=ESMTP helo=<mx-out.facebook.com> So the mail is SPF (Sender Policy Framework) failing. Email domains use this protocol to specify which mail hosts are authorised to use this domain in the SMTP HELO and MAIL FROM commands....

September 13, 2019 · Dennis Kruyt