Message Rejected Per Spf Policy. 550 Message rejected because SPF check failed Type their domain in to this tool (an SPF record checker) and see if it passes If not the problem is on their end an invalid SPF record means it could be spam / or a forged address and it seems reasonable to me to reject such messages 42/5 (188).
Fix Email Delivery Issues For Error Code 550 5 7 1 In Exchange Online Microsoft Docs from Microsoft Docs
DiagnosticCode smtp 550 571 Message rejected due to SPF policy LastattemptDate Sat 21 Nov 2020 114612 +0100 Other recipients on the CC list receive the email without problem and when I send an email from my GMail account to the xtraconz domain it also arrives without problem so this looks like a Bluewin>Xtra issue only.
message rejected due to SPF policy Swisscom Community DE
550 570 Email rejected per SPF policy For the last several months a lot of the emails that are sent from my employees are going to the spam folders of our customers Especially when there is an attachment There's no rhyme or reason Some make it through and some don't We have tried everything but we can't get it to stop.
550: 5.7.0 Email rejected per SPF policy Microsoft Community
If the email originates from an IP listed in SPF record recipient server accepts mail Likewise when sending email from an IP address not available in SPF record it results in a delivery status notification sent to the original sender “Error 550 Message rejected because SPF check failed”.
Fix Email Delivery Issues For Error Code 550 5 7 1 In Exchange Online Microsoft Docs
[SOLVED] 550 Message rejected because SPF check failed MS
SPF Validation Failed Understanding and Troubleshooting
“550 SPF check failed” Here's how to fix
If Spam filter service stands between the email systems emails may get rejected as their IP is different from that included in the sender’s SPF records DNS Problems If online checkers say an SPF record is valid the problem may be in DNS such as outages.
