Technology Microsoft links Classic Outlook issue to email delivery problems

[Brownie2019]

Content source

https://www.bleepingcomputer.com/news/microsoft/microsoft-links-classic-outlook-bug-to-email-delivery-issues/

Microsoft is investigating a known issue that prevents some Classic Outlook users from sending emails via Outlook.com.

Affected users are being warned that their message hasn't reached some intended recipients, and they will encounter this problem more often when the Outlook.com account they use to send email is an Outlook profile linked to another Exchange account.

"This message could not be sent. Try sending the message again later or contact your network administrator," the non-delivery report (NDR) error displayed when sending or replying to emails reads.

Read more:

Microsoft links Classic Outlook issue to email delivery problems

Microsoft is investigating a known issue that prevents some Classic Outlook users from sending emails via Outlook.com.

www.bleepingcomputer.com

 

[Bot]

Read more:

Microsoft links Classic Outlook issue to email delivery problems

Microsoft is investigating a known issue that prevents some Classic Outlook users from sending emails via Outlook.com.

www.bleepingcomputer.com

This looks like a real service-side issue affecting some Classic Outlook users when sending through Outlook.com, not a local malware or system infection problem.

What the report is saying

• Some users of Classic Outlook cannot send or reply to emails through Outlook.com.
• The failure appears to happen more often when the Outlook.com account is in a mail profile that is also connected to another Exchange account.
• The visible symptom is an NDR/message send error saying the message could not be sent.

Important context

If the issue is on Microsoft’s side, local troubleshooting usually has limited value beyond basic checks. In other words, this is more likely to be a temporary platform or client compatibility problem than something caused by malware, firewall tampering, or account compromise.

Reasonable next steps for affected users

• Try sending the same message from https://outlook.live.com/ to see whether webmail works.
• If possible, use the new Outlook or Outlook on the web as a temporary workaround.
• Keep Classic Outlook fully updated through Microsoft Office Update.
• If the Outlook profile contains multiple accounts, especially Exchange plus Outlook.com, testing in a separate fresh mail profile may help confirm whether the profile mix is triggering it.
• Check Microsoft’s official service health or support documentation for updates before making major changes.

What I would avoid for now

• I would not jump straight to registry tweaks, Office reinstallations, or profile surgery unless Microsoft publishes a confirmed fix path.
• I would also avoid assuming the account is hacked just because messages fail to send. This specific symptom, by itself, does not prove compromise.

For forum readers, the practical takeaway is that this appears to be a Microsoft/Outlook issue with a temporary workaround path, not a clear security incident. Waiting for Microsoft’s fix while using webmail or another supported client is the safest approach.

Sources

• Microsoft links Classic Outlook issue to email delivery problems
• https://outlook.live.com/

 

[Halp2001]

Well, it looks like Classic Outlook has decided to take an unannounced vacation. Emails are stranded like travelers on a layover, staring at the clock and wondering if they’ll ever take off.

Microsoft says they are “investigating,” which in corporate speak usually means: “Yeah, we know it’s broken, but we haven’t found the missing bolt yet.” Classic Outlook seems to be having an identity crisis and has forgotten how to handle multiple accounts without panicking.

The takeaway? If your emails aren’t sending, it’s not your neighbor hacking your Wi-Fi—it’s just the client going vintage on us. The practical fix is to use the web version or the New Outlook, since they still believe in timely deliveries.

In short, Classic Outlook has become that friend who promises to show up to the party but ends up asleep on the couch. Better not hold your breath.