550 5.7 1 dmarc unauthenticated mail is prohibited
A common error message!
The error message "550 5.7 1 dmarc unauthenticated mail is prohibited" is an SMTP error code that indicates that the email server has blocked an email because it does not meet the DMARC (Domain-based Message Authentication, Reporting, and Conformance) policy of the recipient's domain.
Here's a breakdown of the error code:
- 550: This is the SMTP error code, which indicates that the email was rejected.
- 5.7: This is the SMTP error code extension, which provides more information about the error.
- 1: This is the specific error code within the 5.7 extension, which indicates that the email was blocked due to a DMARC policy violation.
DMARC is a security protocol that helps prevent email spoofing by verifying the authenticity of emails sent from a domain. When a domain implements DMARC, it specifies a policy that dictates how emails from that domain should be treated. The policy can be set to one of three modes:
- p=none: No policy is enforced, and emails are not authenticated.
- p=quarantine: Emails that fail authentication are quarantined (i.e., sent to a spam folder).
- p=reject: Emails that fail authentication are rejected (i.e., not delivered).
In your case, the error message indicates that the email server has blocked the email because it does not meet the DMARC policy of the recipient's domain. This means that the email was sent from a domain that does not have a valid DMARC record or has a DMARC policy set to "reject" or "quarantine".
To resolve this issue, you'll need to ensure that your email server is configured to send emails with a valid DMARC record and that the DMARC policy is set to a mode that allows emails to be delivered. You may also need to work with your email provider or IT department to resolve any issues with your email server configuration.
Here are some general steps you can take to resolve the issue:
- Check your email server configuration to ensure that it is sending emails with a valid DMARC record.
- Verify that your domain has a valid DMARC record in place.
- Check the DMARC policy of the recipient's domain to ensure that it is set to a mode that allows emails to be delivered.
- If necessary, work with your email provider or IT department to resolve any issues with your email server configuration.