Troubleshooting Tips for SMTP Errors in MS Outlook


Recently, some of our readers reported that they encountered SMTP error in MS Outlook. The most common cause of the “Outlook cannot connect to the SMTP server” error is incorrect Outlook configuration settings. An incorrect mail server name due to a misconfigured port in Outlook can cause problems connecting to the mail server and errors when trying to send or receive email.



ms outlook smtp error

Web hosts are often contacted by account holders who are unable to send or receive emails through Outlook. The error message you see in Outlook:

 Task'[email protected] - Submission error reported (0x80042109): “Outlook cannot connect to your outgoing mail server (SMTP). If you continue to receive this message, contact your server administrator or Internet Service Provider (ISP). "

As a website support role for web hosting companies, we are quickly addressing this issue for users whose email accounts are hosted on clients’ servers.

Since there is no single solution for this error, today we will see what are the most common causes of this error and how we can fix them for customers.

What Is Error 550?

When you try to send an email using Microsoft Outlook or Outlook Express, it cannot be sent and it resends with error 550

“550 Requested action not taken: mailbox unavailable”
“550 5 2 1 Email from spam site rejected”

This The error means your SMTP server was unable to send the email. SMTP servers are configured for outgoing email authentication. If you want to fix this error, you will need to authenticate your email client.

Possible Solution:

  1. Make sure you have enabled “My SMTP requires authentication” in the Outlook settings of the incoming mail server.
  2. If that doesn’t work, try disabling the firewall on the local computer you want to send emails from.
  3. If you find that your email accounts are configured correctly, try logging into your email account using the webmail interface. Link:
  4. If you are unable to access your email account through the webmail interface, your problem warrants further investigation on the server side. It may take some time to resolve the problem. In this case, all you have to do is send a support request from your registered email address to [secure email addressE-mail].

    However, if you can successfully access your mail through the webmail interface, everything is fine on the server side and all you need to do is contact your ISP to make sure it is ports 25 and 587 are blocked.

  5. Anyway, the last option available is to reinstall a fresh copy of Outlook if your problems are still not resolved.



How do I fix Send Receive error in Outlook?

  1. Method 1. Make sure you are connected to the Internet
  2. Method 2. Make sure your Outlook email account settings are correct.
  3. Method 3: remove suspicious emails from your inbox
  4. Method 4: Visit your antivirus manufacturer’s website for more suggestions.

Why are my Outlook emails not sending?

There is probably a communication issue between Outlook and the outgoing mail server, which is why the email is stuck in the Outbox folder because Outlook cannot connect to your mail server to send it. – Check with your email provider to make sure your email server settings are up to date.

How do I fix error 0x800ccc0f?

General Methods to Fix Outlook Error 0x800ccc0f
  1. Check for connection problems.
  2. Disable Windows antivirus and firewall.
  3. Check your Outlook profile settings.
  4. Remove suspicious emails from Outlook and Outlook Outbox.
  5. Check the MTU of your router.
  6. Start MS Outlook in Safe Mode.
  7. Use a mailbox repair tool.
  8. Convert OST to PST.