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Email Bounce Types • Library - Connected

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Every place a page here uses this source, in the order the words come in it.

  1. 5xx codes (Hard bounces): Permanent failures. Stop trying. “4xx codes (Soft bounces): Temporary failures. Try again later.” This distinction drives everything else.

    In Soft-bounce retry policies

  2. Message too large (552 4.3.1): Your message exceeds the server's size limit. The only fix is a smaller message. “The correct response is automatic retry with exponential backoff:” Wait 15 minutes, try again

    In Soft-bounce retry policies

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