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How to Stop Business Emails from Going to Junk Folders
Question details
Users need to resolve an issue where their outbound business emails are consistently routed to the recipients' junk or spam folders.
- Product
- Microsoft 365 Exchange
- Device & OS
- not provided
- Scenario
- Sending legitimate business emails to clients, partners, or internal staff.
- Observed behavior
- Legitimate business emails are flagged as spam and delivered to the recipients' junk folders due to missing authentication records or sender reputation issues.
Before troubleshooting, gather a few recent examples of emails that went to junk, including the exact sender, recipient, and time sent, to help isolate the scope of the issue.
Verify Email Authentication Records (SPF, DKIM, and DMARC)
Ensure your domain's email authentication records are correctly set up to prove the emails are legitimate and authorized.
Missing or misconfigured DNS authentication records are the most common reason legitimate business emails are marked as spam by receiving servers. Correctly setting up SPF, DKIM, and DMARC ensures recipients can verify your identity.
Log in to your domain registrar's DNS settings and verify your Sender Policy Framework (SPF) record includes all authorized sending IP addresses and third-party email services.
Access your email admin center (e.g., Microsoft 365 Defender) and ensure DomainKeys Identified Mail (DKIM) is enabled and signing outbound messages.
Publish a DMARC record in your DNS settings to instruct receiving mail servers on how to handle emails that fail SPF or DKIM checks.
Ask Recipients to Update Their Safe Senders List
If the issue only affects specific recipients, ask them to manually whitelist your email address to bypass local spam filters.
Contact Microsoft 365 Support for Sender Reputation Investigation
If all recipients are affected and authentication records are correct, escalate the issue for a sender reputation investigation.
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Frequently Asked Questions
Why are my business emails suddenly going to junk?
This often happens due to changes in recipient spam filter policies, missing or misconfigured SPF/DKIM/DMARC records, or a sudden drop in your domain's sender reputation caused by sending bulk emails.
What is an SPF record and how does it prevent spam?
Sender Policy Framework (SPF) is a DNS record that publicly lists the IP addresses and services authorized to send emails on behalf of your domain. It prevents malicious actors from spoofing your domain, which protects your sender reputation.
How can I check if my sending domain is blacklisted?
You can use free online MX lookup and blacklist check tools (such as MXToolBox) to see if your sending IP address or domain appears on any major anti-spam blocklists.
