Troubleshoot email sending issues

If you're unable to send email, the issue may be related to your password, outgoing mail server (SMTP) settings, or other email configuration settings.

Before you start

Before troubleshooting, make sure you have checked the following:

• Verify that you are using the correct email address and password. Make sure your email account's username does not contain any capital letters.
• Check that your domain name and email hosting subscription have not expired.

Once you have verified these, proceed to the troubleshooting sections below.

We’ve outlined the most common reasons you may be unable to send email. Review the scenarios below to identify the cause and find the right troubleshooting guide.

Did you see a specific error message?

When an email fails to send, your email app or mail server usually displays an error message that can help identify the cause. The message may include an error code such as 530, 535, or 550. You can usually find it in one of the following places:

• A pop-up message that appears after you click Send
• A “Mail Delivery Failed” or “Undeliverable” email in your inbox
• Next to a message that is stuck in your Outbox 

The table below lists the most common email sending errors and their corresponding troubleshooting guides. Since error wording can vary, be sure to check the "Also shown as" details.

Seeing a different error?

Other common error messages are the following:

• 503 Valid RCPT command must precede DATA
• The recipient has been deleted or has no email address
• Mailbox full or quota exceeded

If you see one of these, or an error that isn’t listed above, try the following:

• Verify that the recipient's email address is correct.
• Try sending a test email to a different recipient.   
• Confirm that your outgoing mail server (SMTP) settings are configured correctly. Refer to the Email Setup Guide to see the correct settings for the app you are using.
• Check your mailbox storage quota, which may affect affect both sending and receiving emails.

Are you repeatedly asked to enter your password?

If your email app keeps prompting you for a password, try the following:

1. Verify that you are using the correct email address and password.
2. If you recently changed your password, update it in your email app.
3. Remove and re-enter the password if necessary.
4. Save your changes and send a test email.

If the issue continues, see Email sending error - 535 Authentication Failed.

Can you receive emails but not send them?

If you're able to receive emails but cannot send them, try the following:

1. Verify your outgoing mail server (SMTP) settings. Your settings should look similar to this example:
   • Server: mail.<yourdomain.com>
   • Port: 465 (SSL) or 587 (TLS). Avoid port 25, which many internet providers restrict.
   • Username: your full email address
   • Password: your email account password
     Note: SMTP settings can vary depending on your email hosting subscription and the email app you're using. For example, settings may differ between cPanel email, Plesk email, Titan, Microsoft 365, and Exchange accounts.
      

     Refer to the Email Setup Guide and verify that the SMTP server, port, username, password, and encryption method are configured correctly.

2. Make sure SMTP authentication is enabled. This is the login your email app uses to send email.
3. Confirm that you're using the correct email address and password.
4. Send a test email. 

If the issue continues, check whether you’re getting an error message and find it in the table above.

Still need help?

If you’re still unable to send email, or your error message isn’t listed above, contact our Support Team and provide the following information:

• The complete error message (copy it or take a screenshot)
• The email app (such as Outlook or Apple Mail) you’re using
• The device you are using
• Whether you can receive email
• Whether the issue affects one or multiple email accounts
• The troubleshooting steps you have tried

Providing these details can help speed up troubleshooting.