This email is not connecting all of a sudden in my outlook

Try these steps in order to restore sending and keep the account connected in Outlook:

1. Check Outlook’s connection status
   • In classic Outlook, look at the bottom status bar.
   • If it shows Disconnected, Working Offline, or Trying to connect…, go to the Send/Receive tab on the ribbon and select Work Offline once to toggle back online.
   • After it reconnects, select Send/Receive to sync again.
2. Confirm Internet connectivity
   • Open a browser (Microsoft Edge or Google Chrome).
   • Browse to http://www.microsoft.com or http://www.bing.com.
   • If these sites do not load, fix the network connection first (see Fix network connection issues in Windows in the referenced article), then return to Outlook and try sending/receiving again.
3. Check for large or stuck messages
   • In Outlook, open the Outbox folder.
   • If there is a message with a large attachment (around 20 MB or more), open it, remove or reduce the attachment size, or replace it with a link, then send again.
   • After clearing any stuck items, try Send/Receive again.
4. Verify password and account settings (if the issue started after a password or account change)
   • If the email password was changed recently on the provider’s website, update the same password in Outlook for that account.
   • If messages still won’t send or stay connected, contact the email provider to confirm the correct server, port, and security (SSL/TLS) settings and update them in Outlook.
5. Repair Outlook and the profile if the problem persists
   • Run an Office repair as described in Repair an Office application.
   • If that does not help, repair or recreate the Outlook profile using Fix your Outlook email connection by repairing your profile / Create an Outlook profile.
6. Check antivirus and add-ins
   • If antivirus software scans email, temporarily disable email scanning or contact the antivirus help desk, as it can block sending/receiving.
   • Start Outlook in safe mode (outlook.exe /safe). If sending works in safe mode, create a new Outlook profile and reconfigure the account.

If the mailbox is Outlook.com-based and nothing sends or receives, also check that cloud storage is not full and that the account is not blocked, as described in the Outlook.com article.

References:

• I can't send or receive messages in Outlook
• Can't send or receive email in Outlook.com
• Fix Outlook connection problems for Microsoft 365 account