Issue with Email Delivery to iCloud Addresses

Dear iCloud Support Team,

I hope this post finds you well. I am writing to seek assistance with a recurring issue we have been experiencing when sending emails to iCloud addresses.

Problem Description: When attempting to send emails from our IP address to customers who have iCloud email accounts, we are consistently encountering the error message "554 5.7.1 [HM08] Message rejected due to [specific reason, if available]." This issue has been affecting our email communication with a significant portion of our customer base.

Additional Details:

Our email sending volume is well within the acceptable limits, as specified by our email service provider.

We have reviewed our IP address reputation and ensured that it is not associated with spamming or abuse.

Our email server is configured with proper SPF and DKIM authentication.

Despite these efforts, we continue to experience email rejections when sending to iCloud addresses, and it is negatively impacting our communication with customers who use iCloud services.

Request for Assistance: We kindly request your assistance in investigating this issue and identifying the specific reasons behind the email rejections. Additionally, we would appreciate any guidance or recommendations on how to resolve this matter and improve the deliverability of our emails to iCloud addresses.

Please let us know if there are any specific steps we should take or if you require any additional information from our end to assist in resolving this issue promptly.

Reliable email communication is essential to our business, and we are committed to ensuring that our messages reach our customers who rely on iCloud services.

Thank you for your attention to this matter, and we look forward to your prompt response.

Sincerely,