How To Troubleshoot Zoho Mail Error 550?

Email error 550 is the most common issue faced by the user. The quick and straightforward steps provided on this page can resolve the Zoho mail error 550.

What's The Error Mean?

It's an SMTP (Simple Mail Transfer Protocol) error code that appears when the spam folder blocks the message from reaching the recipient or when the recipient's email server blocks the email. The error is also called SMTP error code 550.

Causes Of The Error

Step 1: The error can occur when the email address of the recipient doesn't exist, or is unavailable or suspended.
Step 2: The recipient's hosting server is temporarily inaccessible.
Step 3: Your domain name is invalid or disabled.
Step 4: You use an email client from a different IP address.
Step 5: The recipient's mail server failed to recognize your email address.

Steps To Resolve

Step 1: Check the recipients' email addresses; make sure that the email address doesn't contain any spelling mistakes or extra spaces.

Step 2: Try to send the email to the recipient after a few hours. The recipient's server may be down temporarily and might return after a while. Give some time for the server to get active and send your mail. If the error message reappears, then proceed with the following steps.

Step 1: Change Your Outgoing Mail Port

Check the email application; if you're using port 25 as the outgoing port, there are possibilities for the server to block email as spam. Change your port to 26, 465, 587, or 2525.

Step 1: The error can occur when the email address of the recipient doesn't exist, or is unavailable or suspended.
Step 2: The recipient's hosting server is temporarily inaccessible.
Step 3: Your domain name is invalid or disabled.
Step 4: You use an email client from a different IP address.
Step 5: The recipient's mail server failed to recognize your email address.

Step 2: Enable SMTP

For Outlook 2016

Step 1: On your computer, select File and click on the Account Settings tab.
Step 2: Check and select your email in the Email tab and tick on the Change icon above it.
Step 3: The Intenet Email Settings window will open. Select Outgoing Server and make sure to tick the My outgoing server (SMTP) requires authentication checkbox. Also click the radio button beside the option Use same settings as my incoming mail server.
Step 4: Click OK and complete the enabling process.

If you need remote assistance to fix Zoho mail error 550, then contact our technical team for further guidance.