There can be multiple causes for this error - which will have to be gone into 
on a case by case basis. Please, as I said, open a ticket  with 
[email protected] or better still, have your provider open the ticket  for 
you.

—srs

From: mailop <[email protected]> on behalf of Carsten Schiefner via 
mailop <[email protected]>
Date: Wednesday, 27 November 2024 at 1:33 PM
To: [email protected] <[email protected]>
Subject: Re: [mailop] Certain ESPs and mailing lists

Andy,

On 27.11.2024 08:49, Simplelists - Andy Beverley via mailop wrote:
>> <[email protected]>: host mx01.mail.icloud.com[17.56.9.31] said: 554 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)
>
> My experience of this particular error message from Apple iCloud is that
> it's content related and generally a blacklisted URL or domain in the
> body of the email.

thank you very much, too, for this piece of information.

Tying all these pieces together will hope fully help my MLSP to get this
sorted.

Cheers,

        -C.
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