I can't receive emails from a specific sender all of a sudden

Hi Lois M,

I understand how important this is, especially because the missing message contains a verification code. Since you can receive other emails from the credit union, the issue may be limited to that specific automated sender address.

Please note that this is a user-to-user forum, so contributors cannot access your mailbox or check delivery logs. Please try these checks in Outlook.com on the web:

1. Search for the sender address in All folders, and also check Junk Email, Deleted Items, Archive, and the Other tab if Focused Inbox is enabled.
2. Check whether the sender is blocked: Go to Settings > Mail > Junk email. Under Blocked senders and domains, remove the Credit Union email address or domain if it appears there. Outlook moves messages from blocked senders to Junk Email.
3. Add the sender as trusted: On the same Junk email page, add the exact Credit Union sender address and, if appropriate, the Credit Union domain under Safe senders and domains, then select Save. This helps prevent trusted senders from being moved to Junk Email.
4. Check whether a rule or Sweep action is moving or deleting the message: Go to Settings > Mail > Rules, and review any rule that mentions the Credit Union, verification code, security code, or the sender’s domain. Outlook rules can automatically move, delete, or sort incoming messages.

If all of the above looks correct and the messages still do not arrive, the best next step is to contact Outlook.com support from inside your mailbox:

1. Go to Outlook.com and sign in.  
2. Click the Help icon (question mark) in the top right corner.  
3. In the Help pane that opens, type a brief description of your issue (e.g., "cannot receive emails"), then press Enter.   
4. Scroll down the page until you see "Still need help?", click Yes.   
5. Select "Chat with a support agent in your web browser."  
6. Review the description of your issue and confirm your email address (ensure it's an email you can access).  
7. Click Confirm to create the service request and then Start chat to connect with an agent.  

I hope this helps.

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Hello @Lois M. I am responding based on my capabilities and experience in handling email system architecture and domain security protocols. That is a very interesting question because this issue involves a specific interaction between Outlook.com's security filters and your Credit Union's automated sending system (MTA), especially since emails from the regular support address can still get through while verification codes are blocked. This problem most likely stems from the reputation of the automated sender address or a synchronization failure in your account's Safelist. The most crucial first technical step is to thoroughly check the Junk Email folder and ensure that not only is the address free from the Blocked Senders list, but also that it is explicitly added to the Safe Senders and Domains list through the filter settings in Outlook Web. Additionally, you must disable the filter feature that checks the option "Only trust email from addresses in my Safe senders and domains list" because this overly restrictive setting often triggers automatic blocking of system-based emails (automated emails), which are frequently flagged as spam by Microsoft's heuristic algorithms.

More deeply technical: if adding to Safe Senders does not yield results, it is highly likely the obstacle lies in the server-level filter (Edge Transport) belonging to Outlook that rejects the connection from that address before the email reaches your inbox. This often happens if the verification code sender address fails SPF (Sender Policy Framework), DKIM (DomainKeys Identified Mail), or DMARC protocol validation. You need to try creating a specific Inbox Rule: direct all emails from that Credit Union address to always be moved to the "Inbox" folder and marked as top priority. This step can sometimes force the system to bypass standard spam filters. Also ensure that your OneDrive and Outlook storage capacity is not near the limit, because automated sending systems often check the destination mailbox status and will immediately cancel delivery (bounce back) if they detect potential storage failure, even though small manual emails can still get through.

Finally, you should consider the IP Reputation aspect of the verification code sender's server, which may differ from the manual support email server. If the Credit Union states there is no problem on their end, ask them to check their SMTP logs for sending to your address to see the error codes (e.g., code 5.x.x or 4.x.x). If there are error codes related to permanent blocking, you are advised to clear your browser cache or try accessing Outlook via Incognito mode to ensure there are no script conflicts on the web interface when processing incoming data. As an effective alternative technical solution if SMTP protocols remain blocked, ask the bank whether they can "whitelist" your email address on the third-party relay service they use (such as SendGrid or Mailgun) to ensure the verification code delivery path is not distorted by external security filters that might consider repeated code sending as suspicious activity.

Thank you and Best Regards 🙏