#StackBounty: #g-suite G Suite email forwarding with SRS

Bounty: 100

I’m forwarding email from my G Suite domain to an Outlook.com email address. This worked perfectly fine until earlier this month. All forwarded emails go directly to junk, because SPF is failing.

For example: grouponmail.nl -> G Suite -> Outlook.com. In Outlook.com the email headers are:

Authentication-Results: spf=softfail (sender IP is
 smtp.mailfrom=bounce.r.grouponmail.nl; outlook.com; dkim=pass (signature was
 verified) header.d=r.grouponmail.nl;outlook.com; dmarc=pass action=none
 header.from=r.grouponmail.nl;compauth=pass reason=100

So the G Suite server is still using Groupon’s from address when forwarding which causes the SPF to fail. I can’t find any option to rewrite the from address when creating a new route. All options are listed here: https://support.google.com/a/answer/6297084.

How can I rewrite the from address when forwarding email using G Suite (also known as SRS/Sender Rewriting Scheme)?

Get this bounty!!!

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