Mail reject

A "mail reject" occurs when an email is not delivered to its intended recipient due to various reasons. Here are some common causes of mail rejects:

1. Invalid email address: The email address is misspelled, does not exist, or is not valid.
2. Domain not found: The domain name of the recipient's email address is not recognized or does not exist.
3. Mail server issues: The mail server of the recipient's email provider is down, experiencing technical difficulties, or is not configured correctly.
4. Spam filters: The email is flagged as spam by the recipient's email provider or their email client's spam filter.
5. Firewall or network issues: The email is blocked by a firewall or network configuration issue.
6. Email client issues: The email client (e.g., Outlook, Gmail) is not configured correctly or is experiencing technical difficulties.
7. Quota exceeded: The recipient's email account has exceeded its storage quota, and the email cannot be delivered.
8. Blacklisting: The sender's IP address or domain is blacklisted, which prevents emails from being delivered to the recipient's email provider.
9. Authentication issues: The sender's email account is not authenticated correctly, which prevents the email from being delivered.
10. Content restrictions: The email contains content that is restricted by the recipient's email provider or their email client's settings (e.g., attachments, keywords).

When an email is rejected, you may receive an error message indicating the reason for the rejection. Here are some common error messages:

• "Recipient address rejected: User unknown in local recipient table"
• "Delivery to the following recipient failed permanently"
• "The email account that you tried to reach does not exist"
• "The recipient's email account is full"
• "The message was not delivered due to a permanent failure"

To resolve a mail reject, you can try the following:

1. Check the email address for typos or errors.
2. Verify the recipient's email address and domain.
3. Check the recipient's email provider's status page for any outages or issues.
4. Check your email client's settings and configuration.
5. Try sending the email again after a short period.
6. Contact the recipient's email provider or IT department for assistance.
7. Check your email account's quota and delete unnecessary emails to free up space.
8. Check your IP address or domain for any blacklisting issues.
9. Verify your email account's authentication settings.
10. Check the email content for any restrictions or issues.