ARC Failures when delivering to my outlook.com account

Question

ARC Failures when delivering to my outlook.com account

Bret McGee 0

Hi, This is regarding inbound mail to my outlook.com account I have been struggling to understand why e-mails that get forwarded to my outlook e-mail address are getting ARC failures. arc = fail (35) and arc = fail (47) are totally useless when trying to figure out what is going on. The basic setup is as follows: I have an MTA that forwards e-mail to my outlook.com address. It's for the purpose of hiding my real outlook address in that I can give out random addresses for a domain that I own. However no matter what I have tried outlook.com shows an arc=fail (35) or (47). If my MTA forwards to yahoo, gmail or fastmail those systems do NOT find any issues with the arc chain and their MTAs marked it as passed. Can anyone please shed light into what that error codes mean as they are not helpful! Thanks Bret

Paul Enlund 0 Reputation points

2024-03-16T18:01:18.53+00:00

Hello

I'ave seen/suffered similar issues and the following resolved my issues. Make sure you include the header DKIM-Signature in the sigs your ARC-Message-Signature signs. The name used for the arc signing domain -d=... must not be longer 15 characters if the DKIM key is 2048 bit hash sha256.

If your using opendkim and can see (.... key; ) in the comment section of it's auth header edit and recompile to loose the ';' character in the comment

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Paul Enlund 0 Reputation points

2024-03-16T18:01:18.53+00:00

Hello

I'ave seen/suffered similar issues and the following resolved my issues. Make sure you include the header DKIM-Signature in the sigs your ARC-Message-Signature signs. The name used for the arc signing domain -d=... must not be longer 15 characters if the DKIM key is 2048 bit hash sha256.

If your using opendkim and can see (.... key; ) in the comment section of it's auth header edit and recompile to loose the ';' character in the comment

Answer 1

ChristyZhang-MSFT 26,126 Microsoft External Staff

Hi @Bret McGee ,

Welcome to our forum!

Looks like the issue is more related to your account, please kindly understand that the Outlook tag here we mainly focus on general issues about Outlook desktop client. It's suggested that you could post your case in dedicated forum for Outlook.com for more professional advice. Thank you for your understanding and support!

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ChristyZhang-MSFT 26,126 Reputation points Microsoft External Staff

2024-02-19T06:47:08.23+00:00

Hi @Bret McGee ,

Just checking in to see if above information was helpful. If it is useful, would you mind marking the helpful post as an answer? Which would benefit others who also has similar issues in forum.

Answer 2

Kirill A. Korinsky 0

Dear @Bret McGee ,

I'm facing the same issue right now and I'd like to know do you find any clue that does 35 and 47 means?

Thanks!

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ARC Failures when delivering to my outlook.com account

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