Why Outlook stops sending or receiving

When Outlook suddenly stops sending or receiving email, it is rarely a sign that anything is permanently broken, and your existing emails are almost never at risk. In most cases it is a connection setting, an account configuration that has drifted, a misbehaving add-in, or a full mailbox quietly rejecting new mail. The trick is to work through the likely causes in order rather than jumping straight to drastic steps like reinstalling Office, which is hardly ever necessary.

It helps to first work out whether the problem is Outlook itself or the email account behind it. If your email also fails when you log in through webmail in a browser, the issue is with the account or the mail server, not Outlook. If webmail works fine but Outlook does not, the problem is on your computer. The steps below keep that distinction in mind as they narrow things down.

Common reasons Outlook will not send or receive

Across the Outlook problems we are called out for, the cause is usually one of these:

  • Work Offline is switched on. A single setting that quietly stops all sending and receiving, and catches people out constantly.
  • Wrong or outdated account settings. Incoming or outgoing server details that no longer match what your provider requires.
  • A faulty add-in. A third-party add-in misbehaving and stopping Outlook connecting or processing mail.
  • A full mailbox. Once the account hits its storage limit, it rejects new mail and can block sending too.
  • A corrupt Outlook profile or data file. The local profile or data file that Outlook relies on has become damaged.
  • An account password change. If the email password was changed elsewhere, Outlook keeps trying with the old one and silently fails.

Work through the steps below in order, starting with the quickest checks.

01

Confirm your internet is working

It sounds obvious, but it is worth ruling out first, because Outlook needs a live connection to do anything. Thirty seconds here saves you from chasing an Outlook fault that is really a dropped connection.

  • Open a web browser and load any website
  • If the site loads, your internet is fine and the problem is within Outlook or your account
  • If it does not, fix the connection first, and our WiFi disconnecting guide may help
02

Check whether Outlook is set to Work Offline

This is the most common cause of all, and the easiest to fix. Outlook has a Work Offline mode that stops everything sending and receiving, and it is surprisingly easy to switch on by accident.

  • Look at the bottom right of the Outlook window, where it should say Connected
  • If it says Working Offline, go to the Send / Receive tab at the top
  • Click Work Offline to switch it back off
03

Test the account in webmail

This is the step that tells you where the problem actually lives, so it is worth doing early. By logging into your email through a browser, you separate an Outlook problem from an account or server problem.

  • Open a browser and log into your email provider's webmail
  • If webmail also fails to send or receive, the issue is the account or mail server, not Outlook
  • If webmail works perfectly, the problem is on your PC, so continue with the Outlook steps below
04

Restart Outlook fully

A proper restart clears a lot of temporary connection glitches, but only if Outlook closes completely rather than minimising to the background.

  • Close Outlook, then check the system tray (bottom right) to make sure it is not still running
  • If it is, right-click its icon and close it from there
  • Reopen Outlook and test sending and receiving again
05

Check your account settings

Incorrect server settings will stop email sending or receiving even when everything else looks fine, and they sometimes drift after an update or a provider change. If your email password was recently changed on another device, this is also where Outlook will be tripping up.

  • Go to File → Account Settings → Account Settings
  • Select your email account and click Change
  • Check the incoming and outgoing server details against what your provider lists
  • If you recently changed your email password, update it here too
06

Disable add-ins

A faulty third-party add-in can stop Outlook connecting or processing mail correctly. Turning them all off temporarily is a quick way to find out whether one is the cause.

  • Go to File → Options → Add-ins
  • At the bottom, set the dropdown to COM Add-ins and click Go
  • Uncheck all of them and click OK, then restart Outlook
  • If it works again, re-enable them one at a time to find the culprit
07

Check whether your mailbox is full

A mailbox that has hit its storage limit will reject incoming mail and, on some setups, block sending as well. This is especially common on hosted and business email accounts with fixed quotas.

  • Log into your email through webmail and look for a storage or quota indicator
  • If you are near the limit, delete large attachments and old mail, or empty the Deleted Items and Junk folders
  • Business accounts may need the mailbox size increased by whoever manages your email
08

Run a Quick Repair on Office

If Outlook itself has become corrupted, Office includes a built-in repair that fixes it without a full reinstall and without touching your emails. This is the right step once the simpler checks have not helped.

  • Go to Control Panel → Programs → Programs and Features
  • Find Microsoft Office or Microsoft 365 in the list and click Change
  • Choose Quick Repair first, which works offline and is fastest
  • If that does not fix it, run Online Repair, which is more thorough

A note for business and Microsoft 365 email

If you are on a business account, particularly Microsoft 365 or a hosted Exchange mailbox, some of these problems sit on the server side rather than on your PC, and they are not things you can always fix from Outlook. A mailbox over its quota, a licence that has lapsed, a password reset that needs pushing out, or a mail-flow rule blocking messages are all common causes that need handling from the account or admin side. If Outlook is failing for several people in the same business at once, that is a strong sign the cause is server-side rather than a problem on any one computer, and it is worth getting it looked at properly so important email is not quietly going missing.

Email problems can look simple but often turn out to be account, server, or configuration issues, especially when they keep coming back. If you have worked through these steps and Outlook still is not behaving, it is worth getting it checked so you are not missing important emails. If you are in Johannesburg or Gauteng and need help sorting it out, you are welcome to reach out.

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