How to Fix Error 550 in Outlook 2016, 2013, 2010, & 2007?

When the outgoing server (SMTP) does not recognize you as an approved user, you will receive an error 550 message. In this blog, we’ll look at how to Fix Error 550 in Outlook 2016 or other versions? So, without further ado, let’s get started.

Simple Mail Transfer Protocol (SMTP) is an outgoing server used to send and receive emails from a specific domain. It’s part of the TCP/IP protocol’s application layer, and without it, the emails wouldn’t get anywhere. Most organizations use SMTP with POP3 or IMAP. If the outgoing (SMTP) server does not accept the recipient as an authentic person, the email may be rejected and returned with an SMTP error 550.

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

In other words, the error code 550 indicates that your SMTP server failed to deliver the sent email to the recipient.

Without wasting any time, use eSoftTools Outlook PST Repair tool to repair corrupt Outlook PST files. This tool has incredible features such as the ability to recover all data from a corrupted file without losing any, the ability to recover data from encrypted files, and much more.


Some possible causes of email error 550

There are various reasons for this error message including:-

  • Unconfigured SMTP Server settings
  • Email address typed incorrectly.
  • Restrictions by your Internet service provider.
  • Malware or Virus

How to Fix Error 550 in Outlook 2016, 2013, 2010, & 2007?

Whatever the cause of error 550, we suggest you to fix it as soon as possible to prevent further problems. So, here are some of the most effective solutions to this problem.

Solution 1:- Double-check your email address

There’s no need to be worried if you get error 550. Almost always the error message appears when you typed the recipient’s email address incorrectly. In this case, double-check the email address of the recipient to ensure it is accurate. If this isn’t the case, make sure you’ve entered the right address and start sending the email again.

If the problem continues, use a different way to fix it.

Solution 2:- Change SMTP settings to fix Error 550 in Outlook

Error 550 can also occur as a result of incorrect SMTP settings. To fix the issue, make the necessary changes in outlook. To do this open outlook go to Tools and Accounts section from Outlook settings. Now go to the email address you’re having trouble with and choose View/Change Email Account.

After that, double-check the configured SMTP server settings. Then, under further settings, select the outgoing server tab. Select the “My server requires authentication for the outgoing server”. Then save to confirm your changes. Now try sending an email again.

Solution 3:- Restrictions by your Internet service provider

ISP(Internet service provider) blockage is another, though less common, cause of error 550. Whenever the junk email folder fills up, the network administrators immediately limit the SMTP server to avoid spam on the network. If this is the case, contact your ISP’s administration to resolve the problem.

Solution 4:- Remove Viruses and malware from the computer

Viruses and malware will sometimes cause error 550. So get rid of all the viruses, malware, Trojans, and spyware. You can do this for any antivirus software, and make sure your firewalls are turned on and up to date.


The above-mentioned methods can be used to fix Error 550 in Outlook 2016. Sometimes the Outlook SMTP Error 550 arises because of corrupt data files. You can fix this issue by using an Outlook repair tool such as eSoftTools Outlook Recovery Software.


The program fix the problems in three easy steps: Select the Outlook data file, then scan and restore PST file and save it as new PST file in Outlook. The software works with all versions of Outlook, including 2016, 2013, 2010, and earlier, making it easier to fix the email client.

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