Com.sun.mail.smtp.smtpsendfailedexception: 554 5.2.252 sendasdenied
A pesky error!
The error message "554 5.2.252 sendasdenied" is a response code from the Simple Mail Transfer Protocol (SMTP) server, indicating that the email was not delivered due to a sending restriction.
Here's a breakdown of the error code:
554: This is the SMTP response code, which indicates that the email was not delivered.5.2.252: This is a specific error code within the 5.x range, which indicates that the email was not delivered due to a sending restriction.sendasdenied: This is a human-readable message that indicates that the email was not delivered because the sending IP address or domain is not allowed to send emails.
This error can occur for several reasons, including:
- Blacklisting: The sending IP address or domain is listed on a blacklist, which indicates that it has been associated with spam or other malicious activities.
- Greylisting: The receiving server is implementing greylisting, which temporarily blocks unknown senders to prevent spam. The sending server may need to retry the email after a short delay.
- Domain or IP restrictions: The receiving server may have restrictions in place to prevent emails from specific domains or IP addresses.
- Authentication issues: The sending server may not be properly authenticated or may be using an invalid username or password.
To resolve this issue, you can try the following:
- Check your sending IP address: Verify that your sending IP address is not listed on any blacklists. You can use tools like MX Toolbox or Spamhaus to check your IP address.
- Verify your domain and IP restrictions: Check with your email provider or the receiving server to see if there are any restrictions in place that may be blocking your emails.
- Check your authentication settings: Ensure that your sending server is properly authenticated and using valid credentials.
- Try retrying the email: If the issue is due to greylisting, you can try retrying the email after a short delay.
- Contact your email provider or the receiving server: If none of the above steps resolve the issue, you may need to contact your email provider or the receiving server to investigate further.