How to Fix Error 550 in Outlook? – Error Solved!

Ritu Roy | fix How to's Outlook Software Technology | 3 minutes read | Modified on: 15-05-2024
how to fix error 550 in outlook

For email users, Microsoft Outlook Error 550 can be a frustrating barrier. It typically comes with a notice stating that the recipient’s mailbox is inaccessible or that the email cannot be delivered. When the message is rejected by the recipient’s email server for any number of reasons, this error usually happens. We’ll go over the typical reasons of Outlook Error 550 in this comprehensive article, along with helpful fixes to get you back up and running.

What is Outlook 550 Error Code?

When you try to send an email using Outlook Express or Microsoft Outlook, a send problem occurs and the email returns with an error message (550) saying as

“550 Requested action not performed: mailbox not accessible
“550 5 2 1 message from blocked spam domain”

This error indicates that the email you sent could not be delivered by your SMTP server. The SMTP servers are set up to require authentication before sending out emails. Therefore, you must authenticate your email client in order to repair this problem.

Read More

How to Fix Outlook Error 0x80040115

What are the Causes of Error 550?

This error message is occurring for a number of reasons, including:

  • Incorrect SMTP Server configuration
  • Incorrect email address entered.
  • limitations placed in place by your ISP.
  • Virus or Malware

How to Fix Error 550 in Outlook 2021, 2019, & 2016?

Consider using the following fixes to fix Outlook Error 550 and send your emails successfully:

#1. Check your Email Address Twice

If you receive error 550, you don’t need to worry. When you type the recipient’s email address wrong, the error notice almost always shows. Make sure the recipient’s email address is correct in this instance by checking it twice. If not, confirm that you have typed in the correct address and begin sending the email once more.

Try a new approach if the issue persists.

#2. Adjust the SMTP settings in Outlook to resolve Error 550.

Incorrect SMTP settings can also result in Error 550. Adjust Outlook as necessary to resolve the problem. Navigate to the Tools and Accounts section in the Outlook settings to accomplish this. Select View/Change Email Account after selecting the e-mail address that is giving you difficulties.

Next, verify the SMTP server configuration one more time. Next, choose the outgoing server tab from the further settings. Choose the option “Authentication is required for the outgoing server on my server.” After that, save to verify your edits. Try sending an email once again now.

#3. Internet Service Provider Restrictions

Error 550 can also be caused, though less frequently, by ISP (Internet service provider) blocking. The SMTP server is instantly limited by network managers if the junk email folder gets full in order to prevent spam on the network. To fix the issue if this is the case, get in touch with your internet service provider’s management.

#4. Clean the machine of any viruses and malware.

Error 550 is sometimes caused by malware and viruses. Thus, eliminate every virus, malware, Trojan horse, and spyware. Make sure your firewalls are turned on and up to date, and you can accomplish this with any antivirus program.

Also Read –

Guide to Fix Outlook Error Code 0x800CCC0E 

How Do I Manage a Corrupt PST file?

Another possible cause of email error 550 is corruption in the Outlook Data File (PST). To repair PST file corruption in Outlook, utilize the Scanpst.exe (Inbox Repair Tool) feature. The utility may be useful if your PST file isn’t seriously damaged. In the event that it isn’t, using professional Outlook PST Converter software, like CubexSoft PST File Converter, is the best course of action. All sizes of PST files are supported by the utility. You can save the file in several formats, including PDF, RTF, MSG, EML, HTML, MBOX, OLM, CSV, ICS, Thunderbird, Zimbra, and so on, and fix it. The Import/Export wizard can be used to import the file after it has been fixed.


The email error 550 can occur for a number of reasons. To fix the problem, you can use the previously mentioned procedures. If nothing resolves the problem, the Outlook Data File may be the problem. To fix the file, you can utilize Outlook’s built-in repair tool, Scanpst. In the event that it is unable to fix the file, you can use an expert program.