Troubleshoot Error 550

Error 550 – What is it?

Error 550 is a SMTP (Simple Mail Transfer Protocol) outgoing server error code.

It usually occurs when you try to send emails through your Outlook account and the email message encounters a relay error. The email returns back without being delivered with a 550 error message.

The error message is prompted as either of the following:

“550 Requested action not taken: mailbox unavailable”

“550 5 2 1 mail from refused spam site”

In other words, the error code 550 means that your SMTP server was not able to deliver the sent email to the user.

Solution

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Error Causes

There are multiple reasons for this error message including:

  • The email address was typed incorrectly
  • Incorrect SMTP Server settings
  • ISP placing restrictions for outgoing mails on the email server
  • System infected by virus or malware

Further Information and Manual Repair

outlook error 550

Regardless of what the reason may be for the error 550 code occurrence, it is advisable to repair and fix the issue quickly to avoid inconvenience.

You may not be able to send emails from your Outlook account if the error continues. This can cause great hassle in corresponding with others timely and may create a big communication gap.

Here are some quick and efficient ways to resolve this issue on your system:

Solution 1:

There is no need to panic when you encounter error 550. Sometimes the error message may occur because you inserted the wrong/ incorrect email address of the recipient.

In such case, cross check the recipient’s email address to verify if it is correct. If not, insert the correct address and try sending the email again.

Solution 2:

If the error still persists, try other methods to resolve. Sometimes error 550 can also occur due to incorrect SMTP settings.

Fix it to resolve the error. This can be done by opening your Outlook settings Tools and Accounts option. Now go to view/change email account for the email account you are having problems with.

After that check the SMTP server is set to mail.yourdomain.com. Then click more settings and then click outgoing server tab. See if the ‘My server requires authentication for the outgoing server’ is checked. If not, then check on it. Then simply save to confirm changes. Now try emailing again.

Hopefully this will resolve the issue.

Solution 3:

Another reason for the error occurrence can be ISP blockage.

When the junk email volumes increase, network administrators (the people who are responsible for managing ISP servers) place restrictions on SMTP email servers to prevent spam on their network. If this is the reason, contact your ISP administrator to resolve the issue.

Solution 4:

Malware and viral infection can also be the cause for error 550. To remove all kinds of viruses including Trojans and spyware and fix the issue right away without compromising on the speed of your PC it is advisable to download Total System Care.

How to Fix error 550

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