Cannot send mail was rejected by the server

The frustrating error message "Cannot send mail, was rejected by the server"!

This error typically occurs when your email client or server is unable to deliver an email to the recipient's email server due to various reasons. Here are some possible causes and solutions to help you resolve the issue:

  1. Check your email account settings:
    • Ensure your email account settings are correct, including the username, password, and server settings.
    • Verify that your email account is active and not suspended or blocked.
  2. Check the recipient's email address:
    • Make sure the recipient's email address is correct and valid.
    • Check if the recipient's email account is active and not blocked.
  3. Check your email client's configuration:
    • Verify that your email client is configured correctly, including the SMTP server settings.
    • Check if your email client is using the correct port (usually 25, 587, or 465).
  4. Check for firewall or antivirus software issues:
    • Ensure that your firewall or antivirus software is not blocking the email client's connection to the email server.
    • Try temporarily disabling the firewall or antivirus software to see if it resolves the issue.
  5. Check for email server issues:
    • Check the email server's status page or contact your email provider's support team to see if there are any known issues or maintenance scheduled.
    • Try sending an email to a different recipient to see if the issue is specific to the recipient or the email server.
  6. Check for spam filters:
    • Verify that your email client or email provider's spam filters are not blocking the email.
    • Try whitelisting the recipient's email address or domain to see if it resolves the issue.
  7. Check for email client updates:
    • Ensure your email client is up-to-date and running the latest version.
    • Try updating your email client to see if it resolves the issue.
  8. Contact your email provider's support team:
    • If none of the above steps resolve the issue, contact your email provider's support team for further assistance.
    • They may be able to help you troubleshoot the issue or provide additional guidance.

Remember to always check the email server's response code (e.g., 550, 451, 452) to get more information about the error. This can help you identify the specific cause of the issue and take targeted steps to resolve it.