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Cannot email icloud?

7387440 shared this problem 20 months ago

Whenever I'm trying to email my icloud email address the message is rejected, pointing to a message about bulk mail. Are they saying mailbox.org is sending bulk email to icloud addresses? I've never emailed my icloud address before today.

Is there anything I can do or is this a problem for mailbox.org?

<cloud....@me.com>: host mx1.mail.icloud.com[] said: 550 5.7.1

[CS01] Message rejected due to local policy. Please visit

https://support.apple.com/en-us/HT204137 (in reply to end of DATA command)

Comments (2)


I've also just noticed this problem and have raised a support case for it.

If I put a few recipients in the To: field (including the iCloud ones), they all get to their destinations, passing all SPF, DKIM and DMARC tests, except for the iCloud recipients.

This is only happening with my custom/personal domain though. Sending via @mailbox.org works fine.

Any other service I've tested with my personal domain work just fine. The only pattern is mailbox.org + personal domain.


I can't send an email to my icloud address from the mailbox.org website, but I can from my iPhone via the mailbox.org imap server. So I sent an email to my gmail account from both, and compared the headers. There are a number of differences.. one thing that could be looked at is the Message-ID header on the email from the website.. the message that goes from the IMAP server specifies Message-Id, and I believe mail headers may be case sensitive.

The only other difference I can see is that of the content type headers.