Luke, you might want to share SendGrid's logic on that. to the list. if you keep sending to 5xx too many times, that will be 'bad' for your reputation.

When/where do you retry? How often, for how long.. under what circumstances?

On 2023-02-25 19:15, Luke via mailop wrote:
I can assure you sendgrid retries 4xx. We also don't retry 4xx. We also retry 5xx. We also don't retry 5xx. How is it 2023 and people still think 4xx means retry and 5xx means don't retry?

Luke

On Sat, Feb 25, 2023, 9:21 AM Michael Orlitzky via mailop <mailop@mailop.org <mailto:mailop@mailop.org>> wrote:

    On Fri, 2023-02-24 at 15:57 -0500, Christine Borgia via mailop wrote:
     > It is transient, but they are blocks and are not retried. Weird,
    right?
     >

    SendGrid doesn't retry on 4xx and haven't for many years.

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