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I have a domain example.com pointing at a Google Cloud load balancer. Requests get served by one of several Compute Engines behind the load balancer.

The load balancer ip is 1.2.3.4

Now when I send email from email@example.com sometimes it gets black listed because the reverse lookup for 1.2.3.4 does not return example.com instead it returns 71.22.211.130.bc.googleusercontent.com

I know that I can set a PTR on the individual virtual machines behind the load balancer but I don't think this will solve the problem.

Is there a solution that will make 1.2.3.4 return example.com or another typical solution?

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  • Could you explain in detail how you are sending your email? From where, using which services? SPF? Using actual domains, IP addresses and examples of errors helps to narrow it down. – Esa Jokinen May 1 '18 at 7:15
  • We are using Rolby to send emails using @legalcentric.com – Stewart Megaw May 6 '18 at 15:54
  • Ip address of legalcentric.com is 130.211.22.71 Office 365 is used for managing email accounts. MX legalcentric-com.mail.protection.outlook.com SPF v=spf1 include:spf.protection.outlook.com -all The Rolby emails are blacklisted on spamhaus.org/pbl – Stewart Megaw May 6 '18 at 16:05
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[I would leave a comment, but I don't have enough reputation]

Have you try checking this website? There you can see as Google says "SPF must allow Google servers to send mail on behalf of domain", and it links to this article. I also gives some other recommendation, it may helps you.

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