Top-Notch Hacks To Resolve Outlook Server Error 550

When you try to send emails through the Microsoft Outlook or Outlook Express, you might encounter Outlook server error 550. 

As a result, the SMTP server will not able to deliver the send email. Also, an error message saying, ‘550 Requested action not taken: mailbox unavailable’ pops up on the screen.

So, if you encounter this error code and want to eliminate it permanently, then stay in this blog, 

In the rest of the article, you will be aware of all the easy and effective solutions that you can try to fix the issue within no time.

What Causes Error 550 in Outlook?

There are four main reasons for which the users encounter Outlook server error 550. These are:

  1. Mismatch SMTP server settings
  1. In case, your device is affected by viruses, then also you might encounter the error code 550 on your system.
  1. If you, incorrectly typed the Email address, then it is also a valid reason for this issue.
  1. Sometimes, ISP restrictions can lead to this problem.

Fortunately, you can easily fix this error code with some proven techniques. Now, go through the remaining part as here we have come up with some easy and effective solutions that will surely make your task easier.

Resolve Outlook Server Error 550 with Some Premium Solutions:

There are several ways by which you can eliminate this error from your Outlook application. Here, we have listed some of them. Check them out.

Solution 1- Configure the Email Client

To fix this issue, you need to go reconfigure the email client by going through SMTP authentications. 

This is a very easy process and it totally depends on the version of Outlook that you are using. Take a look below.

If you are an MS Outlook User:

  1. In the beginning, you have to open the MS Outlook. From there, navigate to the Tools menu. Next, tap on the Email Account.
  1. Now, a new page will appear on the screen. Under this section, you have to drop down and mark the dialog box beside the ‘View or change existing email accounts’ option and click on the Next Button.
  1. Next, select any mail account and after that, click on the More Settings option. Then click on the ‘My outgoing server (SMTP) requires authentication’ option.
  1. Thereafter, select the ‘Use the same setting as my incoming server’ option. 
  1. Finally, click on the OK button, then on Next and finally, tap on the Finish button.

For the Outlook Express User:

  1. At first, open the MS Outlook Express and after that, navigate to the Tools menu. Thereafter, click on the Accounts option.
  1. LIke the previous one, you have to highlight an email account and then click on the Properties option, 
  1. Next, navigate to the Server tab. Here, you should scroll down and tap on the ‘Under the Outgoing mail services’. Then, click on the dialog box, locates beside the ‘My server requires authentication’. Further, navigate to the Settings option.
  1. Ensure that the dialog box beside the ‘Use same setting as my incoming mail server’ is marked.
  1. Thereafter, click on the OK button. Next, you have to click on the OK button. 

Next, exit from the page and reboot your machine. If you fail to troubleshoot the Outlook server error 550 this time as well, then move to the next solution.

Solution 2- Fix the Recipient Email Address

If you encounter the Outlook server error 550 on your Outlook account, it does not mean you are in big trouble. 

Sometimes, if you have entered a wrong email address, then you might face this issue.  

In such condition, you simply need to check the email address and if you found it wrong, then immediately correct it. After that, try to send an email. 

If you successfully did so, then your job is over. Otherwise, proceed to the next solution.

Solution 3- ISP Blockage

Another reason for error code 550 is ISP blockage. If there is an upsurge on the junk email folder, then the network administrators prevent Outlook from sending emails. 

In this condition, the best option for you is to contact the ISP administration to fix the error permanently.

Solution 4- Limit the Send Email Number

Most of the Outlook users notice that if they send more than 50 emails per hour, then they encounter this error code on their Outlook account. 

In this scenario, we advise you to send less than 50 emails per hour and thereafter, check if the issue still persists or not. 

If you are still unable to troubleshoot the problem, then have a look at the next solution.

Solution 5- Remove Virus from the System

As we have said earlier, that due to the virus and malware this error code can occur on your display. 

So, what you need to do is simply remove the virus. To do so, you can use the inbuild SFC tool. 

Now, to run the SFC tool, at first, click on the Start menu and after that, type ‘cmd’ within the given field as well as press the Enter button. It will lead to the Command Prompt window.

Once the Command Prompt window opens, then you should right-click on it and choose ‘Run as Administrator’ from the available option. 

A black page will now show on the display. Here, you should type ‘sfc /scannow’ in the given field and press the OK button. 

Depending on the threaten files, the scanning procedure might take some time and once complete, then again reboot your system. Further, try to send emails via your Outlook account.

We believe these solutions are enough to fix the Outlook server error 550. 

Now, we suggest you go through the above-mentioned solutions carefully and apply them one-by-one on your system and check which solution is best for you.