Use these steps to narrow down and resolve the issue:
- Confirm it’s not just Outlook
- Open a browser (for example, Microsoft Edge or Google Chrome).
- Try going to
http://www.microsoft.com or http://www.bing.com.
- If these sites do not load, fix the network first (router, Wi‑Fi, ISP) because email cannot work without internet connectivity.
- Check Outlook’s connection status
- In classic Outlook, look at the status bar at the bottom.
- If it shows Disconnected, Working Offline, or Trying to connect…, Outlook is not talking to the mail server.
- Go to the Send/Receive tab → Work Offline to toggle offline mode off.
- Then choose Send/Receive again and see if messages send/arrive.
- Verify the mail server is actually available
- If this worked previously and suddenly stopped, the mail server itself may be down or misconfigured.
- Contact the email provider or the organization’s IT administrator and ask them to confirm the mail server/service status.
- For Exchange-based services, an admin can use tools like the Microsoft Connectivity Analyzer; if the analyzer reports “The email server is not available”, an IT administrator must fix the Exchange configuration or underlying RPC connectivity.
- Check for firewall / network restrictions (if using POP/IMAP/SMTP)
- Some ISPs or networks block outgoing SMTP or other mail ports.
- Ask the ISP or network administrator whether connections to the mail service’s SMTP/IMAP/POP ports are blocked.
- If they provide an alternative SMTP server, update the account’s Outgoing server setting in Outlook:
- In Outlook for Mac: Tools → Accounts → select the account → in Outgoing server, enter the alternative SMTP server name.
- Verify account credentials and settings
- In Outlook, open account settings and confirm:
- Correct email address, username, and password.
- Any required SSL/TLS options and non‑default ports specified by the email provider.
- If unsure, request the exact configuration (server names, ports, encryption) from the email provider and match them in Outlook.
- If using Exchange and Outlook shows a temporary mailbox or similar issues
- This indicates a server or profile/autodiscover problem, not just a local glitch.
- An administrator should verify the Exchange server health and connectivity.
- If the issue is with a hosted/remote Exchange, follow the provider’s support path to restore the mailbox service.
If the server is confirmed down by the provider or admin, only they can restore service; local troubleshooting can’t fix a server outage. Continue to monitor service health or open a support ticket with the email host.
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