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Albert WidjajaFlag for Australia

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Email bounced from multiple sender ?

Hi All,

When I enabled / redirect the Postmaster email from my Anti Spam appliance, I got to see the below emails coming in hundreds of them daily to my mailbox with the below error:

550 5.7.1 Bounce attack signature verification failed. (in reply to RCPT TO command)
550 Administrative prohibition - envelope blocked - https://community.mimecast.com/docs/DOC-1369#550 (in reply to RCPT TO command)
550 #5.1.0 Rejected by bounce verification. (in reply to RCPT TO command)


How to resolve the problem above ?
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arnold
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Hi Arnold,
Does this mean the email was created from the different systems and then it got rejected since the system who created the email was not having DKIM, DMARC or SPF record ?
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Which email header should I analyse ?
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Thanks !