Shouldn't QuotaIssues cause a Bounce?

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What determines if the bounce is a TransientFailure or a Hard Bounce?

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For Apple, it caused a Bounce
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For Gmail, just a TransientFailure

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If you checked the logs I’d wager Apple returned a 5xx quota and Gmail returned a 4xx. Gmail was more optimistic that the user might delete some mail before the next retry.

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Apple realizes that if you can fill up that much storage space you probably abandoned the mailbox already

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Aha! I see, I see

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For example, we return a 4xx for some period of time, with the optimism that the customer will clean up their stuff. After X time over quota, we change it to 5xx

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Oh that is smart.

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I believe Gmail does the same

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Does it switch from Mailbox Full to Mailbox REALLY Full?

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No, just 4xx to 5xx

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Oh, actually, I think it changes from “Quota violation” to “Extended quota violation” .. but the important part is 4xx to 5xx

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"response": {
            "enhanced_code": {
                "subject": 2,
                "class": 5,
                "detail": 2
            },
            "code": 552,
            "command": "RCPT TO:<xxxxxx@gmail.com>\r\n",
            "content": "The recipient's inbox is out of storage space and inactive. Please direct the recipient to  https://support.google.com/mail/?p=OverQuotaPerm 41be03b00d2f7-b3bbe7c2e27si17838964a12.511 - gsmtp"
        },

Gmail will indeed turn 4xx into 5xx after a while.

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Noice

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Smartie

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You can also trans-code those yourself:

IE: {“mailbox full”:500}

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Nah, I don’t plan to. But I was just curious why iCloud emails failed immediately and Gmail emails continued to be reattempted