We're having an issue with spam coming from the same company even though SPF and DKIM is setup with DMARC to reject. Take this forwarded email for instances....

-------- Original message -------- From: User <u...@company.com> Date: 11/15/18 10:42 AM (GMT-07:00) To: Other User <other.u...@company.com> Subject: OVERDUE INVOICE Sorry for the delay…. This is an invoice reminder. The total for your item is $1,879.17. THX, - User T 123.456.7890 | O 123.456.7891 EMail:u...@company.com

However, the raw headers show as this...

Date: Thu, 15 Nov 2018 18:35:35 +0100
From: User <u...@company.com>
<arte.fin...@creativegroup.com.ec>
To: other.u...@company.com
Message-ID: <860909106225419267.2007038e08376...@company.com>
Subject: OVERDUE INVOICE

Could someone suggest a rule to match the signature with the last From email or envelope from? Or another suggestion how this could be resolved.

Thanks!

--
Robert

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