Mail delivery failed: returning message to sender

Create: 2021-06-13
Update: 2021-06-13
Score: 0
Safe: Yes

This message was created automatically by mail delivery software. A message that you sent could not be delivered to one or more of its recipients. This is a permanent error. The following address(es) failed: (generated from host [] SMTP error from remote mail server after RCPT TO:: 550-Verification failed for 550-The mail server does not recognize as a valid sender. 550 Sender verify failed

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