Proofpoint / SMTP error code 550

smtp;550 5.7.0 Email rejected per sender's DMARC policy

High severity

The sent message failed the DMARC policy for the sending domain. If the sending domain has a reject policy set for DMARC, the message must pass DKIM or have SPF aligned to the domain with a custom Return-Path. To resolve this, you'll need to contact your email service provider to see how to send a message that passes DMARC support.

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