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Apple SMTP 552 Errors: Every Bounce Response Explained

Every SMTP 552 response on record from Apple (icloud.com, me.com, mac.com), with the verbatim text, the enhanced status code, a severity rating and a plain-English fix.

The message was rejected for exceeding a size or storage limit, either the recipient's mailbox allowance or a maximum message size set by the receiver.

Provider
Apple
Code
552 (5xx)
Responses
1
Highest severity
Unclassified

Apple SMTP 552 responses

Apple SMTP 552 questions

›What does an SMTP 552 error from Apple mean?

The message was rejected for exceeding a size or storage limit, either the recipient's mailbox allowance or a maximum message size set by the receiver. At Apple, it is a permanent rejection, and the specific reason is in the enhanced status code and message text of each response below.

›How do I stop Apple from returning SMTP 552?

Match your bounce text to one of the responses below and follow its guidance. Recipient-side wording means fix the address. Authentication or reputation wording (SPF, DKIM, DMARC, blocklist) means fix your sending setup, and check Apple's postmaster documentation.

Other error codes seen from Apple