Emails to Outlook delivered to Junk Email folder with SCL 1

[EDIT Support]

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. 

[#2]

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-...

[#3]

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?

[#4]

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=e...

[#5]

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.

[#6]

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.

[#7]

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?

[#8]

No further updates on this one? We're still seeing this issue.

[#9]

I am investigating the same problem.

In my mail the following issue existed which probably caused the mail to be placed in JunkMail:

• The Envelope From (i.e., Return Path or Mail-From)
  was different from 
• The “Friendly” From (i.e., “Header” From)

[#10]

Any news on this @EDIT Support ?