This check fails, if the return-path host has the BATV-feature activated. BATV blocks messages with a null reverse-path "mail from: <>" with a "No such user"-response:
Code:
sender verify fail for : response to "RCPT TO:" from
mail.domain.com [xxx.xxx.xxx.xxx] was: 550 No such user.
Is there a setting to enable the null reverse-path with BATV activated?
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