Microsoft not accepting email from Telus.net

[RobertJohn]

For the last 3 days I have had emails sent from a Telus.net account blocked from going to any Microsoft account - Outlook.com or Hotmail.ca  The message is the Telus.net account does not meet security requirements.

Message blocked

Your message to xxxxxxxxx@hotmail.ca has been blocked. See technical details below for more information.

The response from the remote server was:

550 5.7.515 Access denied, sending domain TELUS.NET doesn't meet the required authentication level. The sender's domain in the 5322.From address doesn't meet the authentication requirements defined for the sender. To learn how to fix this see: https://go.microsoft.com/fwlink/p/?linkid=2319303 Spf= Pass , Dkim= Fail , DMARC= Pass [PH0P222MB0142.NAMP222.PROD.OUTLOOK.COM 2025-07-11T02:46:02.686Z 08DDBF4C7E03FF6B] [DB9PR06CA0017.eurprd06.prod.outlook.com 2025-07-11T02:46:02.746Z 08DDBF2E3DDD9EF7] [DU2PEPF00028CFC.eurprd03.prod.outlook.com 2025-07-11T02:46:02.745Z 08DDBE6BC5EA76BE]

I was using Outlook(new) to send.  It is up to date

The message can be sent to Microsoft email recipients using Outlook (new) and a Google account. 

I would like to continue using my Telus.net account, which I have used for many years and has extensive contacts established.  Does anyone have a solution to this problem?

.

[RobertJohn]

Here is some more information from Microsoft.  Sorry, it is above my pay grade to solve, but I do notice from my error message that DKIM did not pass.  What Microsoft tells me to do to fix it is not something I no how to do. The Solution is at https://support.microsoft.com/en-us/topic/fix-ndr-error-550-5-7-515-in-outlook-com-34cfe8f8-6fbf-457... 

[RobertJohn]

And further to this, I find it only occurs if I send to more than one email address and use the BCC field.  If I send to just one Microsoft account at a time, the email goes through

[willamabroy2]

"Baixaryoucine: Microsoft is currently not accepting emails from Telus.net addresses. You may need to use a different email provider for now."

[FuzzyLogic]

I just sent a message from my @TELUS.net account to my @outlook.com address using Outlook 2021 (Desktop) and it worked. I checked the message headers and saw this "dkim=timeout (key query timeout)"

I then sent a message via Edge browser logged in my @TELUS.net account and sent to my @outlook.com address and that also worked. This time the headers had this "dkim=pass (signature was verified)"

The error you are receiving appears to be related to something in the From address field as displayed in the headers you included:

The sender's domain in the 5322.From address doesn't meet the authentication requirements defined for the sender.

You would need to check the message headers to see if there is something unusual for your outgoing email address that's causing this.

Normally the field would be something like From: "your name" <youraddress@telus.net>

[RobertJohn]

Thanks for addressing my problem. I understand that changes are being made to the email systems to help prevent phishing attacks. I support this even if it means I have to adapt to new restrictions.

My problem seems to come from me volunteering to send emails to our 45 strata residents using the BCC field to protect their identity. It has worked well for years but just recently has rejected all emails going to a Microsoft-owned account. The failure comes from the Dkim (DomainKeys Identified Mail) field. I tried resending to just the failed 6 addresses using the BCC address field, but all 6 still failed. Individual emails sent to each of the 6 from my Telus account passed.

As a workaround around I can send these bulk emails from my Google account. They all seem to get through. However, in the long term, this will diminish my use of my Telus email account.

As an aside, Passpoint has an extensive writeup on the new security protocalls and how they help prevent phishing. It is more than I want to learn, especially as I cannot implement any solution. It has to be Telus and Google

[FuzzyLogic]

Telus email is hosted by Google.

Have you tried using a web browser to access you Telus account and then do the bulk send there?

[Rocky3]

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@RobertJohn wrote: My problem seems to come from me volunteering to send emails to our 45 strata residents using the BCC field to protect their identity. It has worked well for years but just recently has rejected all emails going to a Microsoft-owned account.

What you describe has occurred with all email servers from time to time. I once got through to a Shaw tech and he said my email address was reported as spam. Then since I was not sending from a Shaw account he could not do anything about it.

I also found trying to save time, more than X number of addresses is also blocked. But these things are constantly changing security. Real SPAM is interfering with legitimate group emails. I suspect my Outlook 2019 will soon be unacceptable.

[RobertJohn]

I have done a little more testing and found that the only time the issue occurs is when I use the BCC field to try and access a Microsoft account, even individually.

The easiest way forward is for this old user to adapt to the new world. I accept that we need more security with our emails. It's time to figure out a better way to send group emails to my friends and strata residents.

Thank you to all who took the time to give me your suggestions. I really appreciate your comments.

[FuzzyLogic]

I had to update my Outlook 2019 to access my @outlook.com email as it doesn't support modern authentication😥