How to fix email error 550 when sending an email

• Any client or account can experience the email error 550, however it is always related to the SMTP.

• This issue arises when the email indicating that the recipient's mailbox is unavailable hasn't been sent by the outgoing server.

• The erroneous email address being entered or malware infection are just two of the many potential explanations for this problem.

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Many email client programmes, including Outlook and Mozilla Thunderbird, can experience email error 550. When some users send emails using client software, the issue occurs.

The SMTP (Simple Mail Transfer Protocol) error code for email sending is 550. When error 550 appears because the recipient's inbox is unavailable, the SMTP server has not yet despatched the email.

What causes the email error 550?

• That may be the result of a number of factors, and in certain cases, the intended recipient may be the one who needs to address the problem rather than the sender.

• Your email client may not be set up correctly, or a more zealous firewall may be blocking it. The most straightforward reason for this mistake, though, is that you supplied the incorrect email address.

• This issue could also arise if the receiver has blacklisted your domain or is unable to access your email for some other reason.

How can I fix the email error 550?

1. Check for email address typos

Email mistakes may result in Error 550. Therefore, make sure you put the email address precisely. Before pressing the submit button, check the email address for typos, odd characters, or spaces.

2. Is the Email IP Blacklisted?

• When error 550 occurs, it's possible that an anti-spam filter has blocked the server IP or domain for the email server. Open the MX Lookup page to see if that is the case.

• In the text box, type your email domain, and then click the MX Lookup button. The entered email domain's IP address information will thereafter be made available.

• You can simply select the "Blacklist Check" option for any of the webmail servers from the list of hostnames and IP addresses to see if it has been blocked by anyone.

• The IP address can also be pasted into the text field on the blacklist check page directly before pressing the Blacklist Check button.

3. Enable SMTP authentication

• In Outlook, start by clicking the File icon.

• If you have multiple accounts, choose one from the list at the top, click Account Settings, and then choose Server Settings from the menu.

• Select the Use same settings as my incoming mail server check box, click the My outgoing server (SMTP) requires authentication check box, and then click the Next button under Outgoing email.

• SMTP authentication can be configured in Mozilla Thunderbird by selecting Tools and Account Settings.

• On the left side of the window, select Outgoing Server.

• Then, after choosing an email server, click Edit to display the window you see below:

• After that, you must enter your email server's SMTP settings. Enter smtp.gmail.com as the server address and 587 or 465 as the TLS/SSL port numbers, for instance, if you have a Gmail account.

• Once the necessary information has been entered, click the OK button.