Mailer daemon error 475

The infamous "Mailer Daemon" error!

Error 475 is a common issue that occurs when your email client or server is unable to deliver an email message. The Mailer Daemon is a system that checks for errors in email messages and prevents them from being delivered if they are malformed or contain errors.

Here are some possible causes of error 475:

  1. Invalid email address: The recipient's email address may be invalid, non-existent, or not properly formatted.
  2. Domain name system (DNS) issues: DNS problems can prevent your email server from resolving the recipient's domain name, leading to error 475.
  3. Mail server configuration: Misconfigured mail servers, such as incorrect settings or firewall rules, can block email delivery and trigger error 475.
  4. Email message format: The email message itself may be malformed or contain errors, such as an invalid "From" or "To" address, or an attachment that is too large.
  5. Spam filters: Overly aggressive spam filters can flag legitimate emails as spam and prevent them from being delivered, resulting in error 475.

To troubleshoot error 475, you can try the following:

  1. Check the recipient's email address: Verify that the recipient's email address is valid and properly formatted.
  2. Check DNS settings: Ensure that your DNS settings are correct and that your mail server can resolve the recipient's domain name.
  3. Check mail server configuration: Review your mail server configuration to ensure that it is set up correctly and that there are no firewall rules blocking email delivery.
  4. Check email message format: Verify that the email message is properly formatted and that there are no errors in the "From" or "To" addresses.
  5. Check spam filters: Check your spam filters to ensure that they are not flagging legitimate emails as spam.
  6. Check email client settings: If you are using an email client, check your settings to ensure that they are correct and that you are not blocking email delivery.
  7. Contact your email provider: If you are still experiencing issues, contact your email provider's support team for assistance.

I hope this helps you troubleshoot and resolve error 475!