Hello Kelly,
Good day!
Thank you for reaching out. I understand that you're experiencing an issue with emails from T-Pro being flagged as "unverified sender" in Outlook, which is a new development. You're looking to understand the cause of this issue and find a solution to control the narrative. I ewant to say we are very sorry for the incovnience casued. Emails being flagged as unverified can be due to several reasons, such as changes in email authentication settings, updates to email clients, or issues with the sender’s domain.
To better understand the issue, I have a few questions:
- Are the emails from T-Pro being sent from a specific domain or email address?
- Have there been any recent changes to your Outlook settings or configuration?
- Are the emails being flagged as "unverified sender" being marked as spam or phishing attempts?
- Are you using any email authentication protocols like SPF, DKIM, or DMARC?
- Have you noticed any other email senders being flagged as "unverified sender"?
6.What version of Outlook do I have? - Microsoft Support.?
Emails are flagged as unverified when the email client cannot confirm the sender’s identity. This usually happens due to:
- Missing or incorrect SPF, DKIM, or DMARC records: These are email authentication protocols that help verify the sender’s domain.
- Changes in email client security settings: Updates to Outlook or other email clients can sometimes tighten security measures.
- Issues with the sender’s email server: If T-Pro’s email server has been misconfigured or blacklisted, it could cause emails to be flagged.
Kindly follow these steps which may help reslve this issue:
For New Outlook
Check Email Authentication Records:
- Ensure that T-Pro’s domain has correct SPF, DKIM, and DMARC records set up. You can use online tools like MXToolbox to check these records.
Add Sender to Safe Senders List:
- Go to Settings > Mail> Junk email.
- Under Safe senders and domains, add T-Pro’s email address or domain.

Update Security Settings:
- Ensure your Outlook is updated to the latest version.
- Check your email security settings to see if any recent changes might be causing the issue.
For Classic OutlookCheck Email Authentication Records:
- Similar to the new Outlook, verify SPF, DKIM, and DMARC records for T-Pro’s domain.
Add Sender to Safe Senders List:
- Go to Home > Junk > Junk E-mail Options.
- Under the Safe Senders tab, add T-Pro’s email address or domain.

Update Security Settings:
- Ensure your Outlook is updated to the latest version.
- Review your email security settings for any recent changes.
- Contact T-Pro: Inform them about the issue. They might need to check their email server configuration.
- IT Support: If the issue persists, consider reaching out to your IT support team for further assistance.
Note*: Please understand that our initial response may not always resolve the issue immediately. However, with your help and more detailed information, we can work together to find a solution.*
If the issue persists after following these steps, I strongly encourage you to submit a service request to our technical support team - Get Support - Microsoft 365 Admin |Microsoft Learn. Their technical experts have access to advanced tools and resources that allow them to thoroughly investigate issues, collect logs, and perform remote sessions to configure your settings. This approach will provide the most effective solution. Rest assured, I will keep an eye on the progress and follow up to ensure a permanent solution office.com after you open a service request.
We apologize for the inconvenience caused by this issue. Please try these steps and let's see if we can continue to open the way forward for service requests. Thank you for your time and understanding. Have a nice day.
Sincerely
Eleni | Microsoft Community Moderator