Messages missing a valid Message-ID header

Please advise why one one of your user is not able to receive emails to his gmail id. We already have required SPF and DKIM info on DNS records.

Message blocked
Your message to XXXXXXXXX@gmail. com has been blocked. See technical details below for more information.

The response was:
550 5.7.1 [209.85.220.41] Messages missing a valid Message-ID header are not accepted. For more information, go to https://support.google. com/mail/?p=RfcMessageNonCompliant and review RFC 5322 specifications. g13-20020adffc8d000000b0033ecaf52428sor1196983wrr.9 - gsmtp

Reporting-MTA: dns; googlemail .com
Received-From-MTA: dns; mail @ ccccc .com
Arrival-Date: Fri, 15 Mar 2024 21:53:04 -0700 (PDT)
X-Original-Message-ID: <65f525b0.050a0220.5f5a.9e0fSMTPIN_ADDED_MISSING@gmr-mx.google .com>

Final-Recipient: rfc822; XXXXXXX@gmail .com
Action: failed
Status: 5.7.1
Diagnostic-Code: smtp; 550-5.7.1 [209.85.220.41] Messages missing a valid Message-ID header are not
550-5.7.1 accepted. For more information, go to
550-5.7.1 https://support.google. com/mail/?p=RfcMessageNonCompliant and review
550 5.7.1 RFC 5322 specifications. g13-20020adffc8d000000b0033ecaf52428sor1196983wrr.9 - gsmtp
Last-Attempt-Date: Fri, 15 Mar 2024 21:53:04 -0700 (PDT)

Hi @gkhanna24

I know this post here is not about missing header, but you might want to read it anyway, as it might give you some insight.

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