Newsletter suddenly classified as 'phishing' by Microsoft. Now what?

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Newsletter suddenly classified as 'phishing' by Microsoft. Now what?

Today, for the first time, we got a message from a newsletter subscriber thatMicrosoft classified our message as phishing.

Did anybody bump into this issue? Any ideas how we could try to solve this?

SPF / DKIM should be ok we were told, even though the screen states 'Pending Configuration' for one of the domains.

Thanks for any suggestions.

Gerard.

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28 REPLIES 28
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Level 1

Re: Newsletter suddenly classified as 'phishing' by Microsoft. Now what?

I'm having the same exact issue.   I wonder if Microsoft recently updated their security settings?    I tried changing the content of the email, sending, everything and all of it is flagged as phishing by O365.

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Level 2

Re: Newsletter suddenly classified as 'phishing' by Microsoft. Now what?

We had the same issue starting today - all emails we sent are getting flagged as potential phishing attempts, even ones we have been sending for years.

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Level 10 - Champion Alumni

Re: Newsletter suddenly classified as 'phishing' by Microsoft. Now what?

Same thing happened to us today.  And this was for an internal newsletter to our Marketing team (about 100 people).  And we have whitelisted all of Marketo's IP address ranges internally (and have SPF and branded sender domain configured properly).  We have never had issues in sending internal emails from Marketo.  Definitely a setting/update that Microsoft applied to their Exchange/O365 servers.  Deliverability was tough previously.  Now it's next to impossible (when sending to Exchange clients - which is the majority of our audiences) unless there's some way to change this.  Although the thing is, the emails are being delivered - but with a that top/pink phishing banner at the top of the email message.

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Level 3

Re: Newsletter suddenly classified as 'phishing' by Microsoft. Now what?

We've had automated internal confluence updates get flagged as phishing as well. I think it's safe to say this is an Outlook thing and not related to MATs. We've had Marketo and Hubspot emails get diverted at times, but not consistently.

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Level 4

Re: Newsletter suddenly classified as 'phishing' by Microsoft. Now what?

Same thing happened to us today as well with an internal email. Just submitted a ticket to support.

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Level 2

Re: Newsletter suddenly classified as 'phishing' by Microsoft. Now what?

I just built and sent one of Marketo's example templates to myself and it still had the phishing warning - but a blank template text email didn't have a warning.  Looks like it's something to do with more complex html.

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Level 4

Re: Newsletter suddenly classified as 'phishing' by Microsoft. Now what?

Same thing happened with me. Text emails are okay, but html emails have the phishing alert.

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Marketo Employee

Re: Newsletter suddenly classified as 'phishing' by Microsoft. Now what?

I forwarded along this topic to our Deliverability team to check into this.  Looking at Twitter though, it might be something going on with Microsoft/Outlook.  I see someone tweeting at Hubspot support asking why all their emails are being marked as phishing attempts with Microsoft too....

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Level 10 - Champion Alumni

Re: Newsletter suddenly classified as 'phishing' by Microsoft. Now what?

Yeah, I don't think this is a Marketo issue - but rather an issue that is impacting any marketing automation/email service provider vendor.  But on the other hand, it is a Marketo issue if emailing to Microsoft/O365 audiences are now going to be flagged like this.  Considering Microsoft themselves are a Marketo customer, let's hope that some sort of resolution can be identified.