Office365 mail rejected when sent via ipv6?

[JackWIT]

I've bene working on this issue for around 2+ months now and have been back and forth with Google workspace support and gotten nowhere. I'm wondering if anyone else has had any luck with this specific issue or has contact with the right people that can help?

The public thread I made about this is here: https://support.google.com/mail/thread/207539747?hl=en

Essentially; Google rejects legitimate mail from Office365 senders due to the IPv6 ranges they're sent from when they're valid senders. If the mail is sent from the same domain via another source & IPv4 they're immediately accepted. 

During our testing we found an obscure issue where replacing the SPF to break the returned IP ranges as so: include:spf.protection.outlook.com to a:spf.protection.outlook.com - this caused Google to accept the mail immediately into inbox & not issue a bounce-back.  - Google fixed this workaround once we brought it to their attention, this work-around no longer works. 

[sdhari]

Hi, we also having the same issue since last week. The public thread you mentioned above, does not have a solution how to use the connector to convert IPV6 to IPV4. Can you please help? we need to fix issue ASAP. Thanks 

[Djinn7711]

Hey mate, did you end up sorting out a connector for this? I have just set one up and can assist you if you need.

[jcndad]

I could use help over here - getting hammered pretty hard on gmail rejections on ipv6 addresses from o365.  all ipv4 working fine.  owe you one - thanks!

[AnnePMitchell]

Hey Djinn!  Would you be able to share the steps with me, pretty please? :~)  Either here or at (PII Removed by Staff)(unless of course you're sending through IPv6 from MS ;~) ).  Thank you!

[surnamer]

Hi anyone, Please I am facing this same issue. I need help. All my emails sent from office 365 using ipv6 are getting rejected by gmail and any other google hosted email domains. 

[jcndad]

feel free to email me at jerry (at) startaround.com

[JackWIT · Accepted solution]

The solution to this is to stop sending to Google for 45 days or force IPv4 connections. 

If you need help with this feel free to reach out at: hello (at) enigma-it.uk