Anyone from Apple/iCloud able to assist with why certain messages from one of our servers - 67.215.1.235 - to certain @icloud.com email addresses are bouncing back with:
554 5.7.1 [CS01] Message rejected due to local policy. Please visit https://support.apple.com/en-us/HT204137 Bounce back messages? Can't find a rhyme or reason. Some messages to @icloud.com email addresses are going out. Some are not. The same message that generates the above message when sent to an @ icloud.com email address is sent out successfully when the message is sent to icloudad...@apple.com - although I'm not sure if @apple.com and @ icloud.com email servers use the same infrastructure. The sending domain has SPF, DKIM, and DMARC and passes all of the tests at https://www.learndmarc.com I am not aware of 67.215.1.235 being listed on any reputable RBLs (I do see it listed in Ascams but I'm not sure how legitimate that RBL is and it's not listed in any others)
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