Emails to Outlook delivered to Junk Email folder with SCL 1

Emails sent from on-premises Exchange 2007 to any Microsoft related email address (outlook.com for example) is being delivered to the users Junk Email folder despite the header information showing SCL value of 1 which is suppose to deliver the email to the Inbox folder.

I've included some header values below if that helps.

X-Forefront-Antispam-Report:
EFV:NLI;SFV:NSPM;SFS:(98901004);DIR:INB;SFP:;SCL:1;SRVR:HE1EUR02HT107;H:<our domain>;FPR:;SPF:None;LANG:;

X-Microsoft-Antispam: BCL:0;PCL:0;RULEID:(5000109)(4604075)(4605076)(610169)(650170)(8291501071);SRVR:HE1EUR02HT107;

X-Microsoft-Antispam-Mailbox-Delivery: abwl:0;wl:0;pcwl:0;kl:0;iwl:0;dwl:0;dkl:0;rwl:0;ex:0;auth:1;dest:J;ENG:(400001000128)(400125000095)(5062000261)(5061607266)(5061608174)(4900095)(4920089)(6375004)(4950112)(4990090)(9140004);RF:JunkEmail;OFR:SpamFilterAuthJ;

I can see from the above value that it is directed to the junk Email folder.

X-MS-Exchange-Organization-SCL: 1

Interestingly, the X-Forefront-Antispam-Report shows SPF:None but the Received-SPF value shows Pass which doesn't seem to match up. That said, I've seen other emails with the same pattern that are delivered to the Inbox so I doubt this is the cause.

We have a SPF record that is correct, and if we email Office 365 customers the same email is delivered to the Inbox. This issue only affects Outlook.com customers. If there is a better community/category for this thread, then I can move/re-post if needed.

Any help much appreciated.

exchange online

Exchange Server

outlook

11 Replies

C_the_S
Bronze Contributor
Jan 30, 2018
I've seen your situation mentioned in the Answers forums and see that some recommend filling out this form: https://support.microsoft.com/en-us/getsupport?oaspworkflow=start_1.0.0.0&wfname=capsub&productkey=edfsmsbl3
- EDIT Support
  Brass Contributor
  Jan 31, 2018
  I have submitted that again and they have now come back and said that our external IP address was listed on the Spamhaus PBL list - this wasn't the case last week when I first submitted the Outlook Deliverability Report however so I am waiting for that to propagate before I test sending to Microsoft's free email platform again to confirm the issue is resolved.
  - EDIT Support
    Brass Contributor
    Jan 31, 2018
    We are no longer listed on the PBL, but the issue remains - as I suspected.
    
    I can't be the only one seeing this issue?
- EDIT Support
  Brass Contributor
  Jan 31, 2018
  I found that too but I'm afraid to say, I have completed that form on two occasions and they have checked the reputation of our external IP address and not found any issues.
  
  When I replied and asked them about why emails with an SCL of 1 are being delivered to the Junk Email folders for recipients, they ignored my questions and repeated their previously response.
VasilMichev
MVP
Jan 29, 2018
The move to Junk folder might be performed by Outlook's antispam engine, not EOP. A quick way to verify this is to check the "info bar" - it will tell you who marked the message as Junk. Or run a message trace - if It was marked by EOP, it will be reflected there.

Here's an easy to follow article on that: https://www.slipstick.com/outlook/rules/moved-message-junk-email-folder/

It can also be due to custom Junk threshold, as detailed for example here: https://support.microsoft.com/en-za/help/3019725/how-to-troubleshoot-unexpected-junk-email-behavior-in-office-365-dedic
- EDIT Support
  Brass Contributor
  Jan 30, 2018
  The "info bar" shows 'This message was identified as spam. We'll delete it after 10 days'
  
  Would this suggest that it was EOP? I didn't think that Outlook.com had it's own Anti-Spam engine - I thought that EOP served that purpose.
  
  Your second link refers to Office 365 which is a slightly different platform that Outlook.com so am I to assume the content of that KB doesn't apply?

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Emails to Outlook delivered to Junk Email folder with SCL 1

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