SMTP Error 471 occurs when the anti-spam filter, anti-virus guard, or firewall interferes with the sending of an email message. This error is often triggered by the prevention of message transmission due to spam-like content or security measures.

What are the cases covered in SMTP Error 471?

SMTP Error 471 in phpmailer Instances & Examples:

• Case 1: "471 5.7.1 Email blocked by anti-spam filter. Content flagged as potential spam."
• Case 2: "471 5.7.2 Anti-virus guard prevents email transmission. Security measure triggered."
• Case 3: "471 5.7.3 Firewall blocks outgoing email. Network security restriction encountered."

SMTP Error 471 in Jenkins Instances & Examples:

• Case 1: "471 5.7.1 Email blocked by anti-spam filter in Jenkins. Content flagged as potential spam."
• Case 2: "471 5.7.2 Anti-virus guard prevents email transmission in Jenkins. Security measure triggered."
• Case 3: "471 5.7.3 Firewall blocks outgoing email in Jenkins. Network security restriction encountered."

What’s Causing This SMTP Error 471 In Your Servers? (in pointers)

SMTP 471 error in phpmailer and Jenkins can occur due to:

• Interference by anti-spam filter: The email message's content is flagged as potential spam by the anti-spam filter, preventing its transmission.
• Intervention by anti-virus guard: The anti-virus guard restricts the sending of the email due to security concerns or detection of malicious content.
• Firewall restriction: Outgoing email is blocked by the firewall as a network security measure, limiting the transmission of messages.

How to Resolve SMTP Error 471 - Step-by-Step Solution

To resolve this email smtp error 471 in Jenkins and phpmailer servers, you need to do the following:

• Verify email content: Ensure that the email message does not contain any spam-like phrases or suspicious content that may trigger filters.
• Disable security measures: Temporarily disable the anti-virus guard, firewall, or anti-spam filter and attempt to resend the email.
• Review security configurations: Adjust security settings to allow the transmission of legitimate emails while maintaining adequate protection against spam and malware threats.