You may try to get support on iCloud user community. If you have good
luck a support staff will answer your question there.
Hey folks,
Is there anyone from Apple able / willing to assist with
iCloud/Me/Mac.com issue? Messages from a reputable sender are being
rejected as "4.1.8 (bad sender's system address)". As far as I can
tell, sender is in full compliance (fully aligned DKIM, SPF, DMARC, A
record on hostnames to dedicated IPs, MX on sending domain(s). Not sure
what else could possibly be needed.
I've already contacted iCloud admin team, but it's been over a week
since the initial issue (missing hostname A record) was addressed by
the sender and the problem persists.
Thanks in advance.
Allen KListrak
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