Rodrigo Severo writes:
A client (Courier in this case) SHOULD treat a 552 error after a RCPT TO command as 452. But the text says SHOULD and not MUST. Is this the reason Courier doesn't treat a 552 error as 452 after RCPT TO? Or does it?
Courier treats all 5xx errors the same. Courier treats all 4xx errors the same.
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