Mail goes to junk at outlook.com even do SPF and DKIM passes

Daniël van Zoelen I can't help but just to advise of my experience.  I have a small web design agency and we host all client websites and email.  The problem you highlight has increased recently even though our IP is clean; dkim, SPF and Reverse DNS records have been long set up; and a dmark policy is in place.

Here's the report I got from MS deliverability team: 

"We have reviewed your IP (XX.XXX.XX.XX) and determined that messages are being filtered (i.e. sent to the Junk folder) based on the recommendations of the SmartScreen® Filter.

Email filtering is based on many factors, but primarily it's due to mail content and recipient interaction with that mail.  Because of the proprietary nature of SmartScreen® and because SmartScreen® Filter technology is always adapting and learning more about what is and isn't unwanted mail, it is not possible for us to offer specific advice about improving your mail content. However, in general SmartScreen® Filter evaluates specific words or characteristics from each e-mail message and weights them, based on their likelihood to indicate that a message is unwanted or legitimate mail."  He then goes on to say that our IP cannot be 'mitigates' (whitelisted) at this time.

Frankly SMARTSCREEN is interfering rubbish.  We have many situations where a company has emailed one of our clients and the reply email has been treated as Junk because of SMARTSCREEN.  This is patently ridiculous - how can a reply be junk?

The clients are all small businesses and none of them send bulk mail or do any heavy marketing. The email content is all perfectly legitimate, has no spammy content, and is NOT rejected anywhere else.  I would prefer emails to bounce back - at least you know it hasn't been delivered. With spam things just get missed - important things like sales opportunities, meetings, rescheduled appointments and so on.

Microsoft cannot be unaware of this issue - but they don't seem to be concerned in the slightest.