CHW-4718 PostmarkWebhookBodyTooLarge
postmark webhook body exceeded the 256 KiB limit
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Default message: postmark webhook body exceeded the 256 KiB limit
HTTP status:413(client)
Problem. The Postmark inbound-webhook endpoint returned 413.
Cause. The webhook body exceeded postmarkWebhookBodyLimit (256
KiB). Returned cleanly instead of being silently truncated, which
would have produced a misleading “envelope was not valid JSON” 400
after json.Unmarshal failed on the cut stream. Fix. Trim the
oversize attachment from the inbound mail flow, or ask the operator to
raise the server-side limit if the deployment legitimately needs
larger payloads. HTTP 413.