SMTP Error 546

What causes this error and solutions

SuprSend provides APIs and components for you to create notification workflows that drive collaboration & actions from your users - ensuring higher product adoption.

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SMTP error 546 indicates your email was rejected because of problems with the recipient's email address or domain. This permanent error (5xx) signifies the recipient server couldn't deliver the message due to issues with the recipient's information. This can occur in applications like phpmailer and jenkins when sending emails.

What are the cases covered in SMTP Error 546?

Common scenarios triggering SMTP Error 546:

  1. Nonexistent Recipient: The recipient's email address (from "RCPT TO" or "To:") doesn't correspond to a valid account or mailbox (phpmailer, jenkins).
  2. Invalid Recipient Domain: The recipient's email domain (e.g., example.com) is non-existent, expired, or has DNS issues.
  3. Unauthorized Recipient: The recipient's domain or address cannot receive your email or is blocked by their server for policy reasons.
  4. Content Filtering: The email's content might contain prohibited elements like spam, malware, or violations of the recipient server's policies.

What’s Causing This SMTP Error 546 In Your Servers?

Potential causes of SMTP Error 546:

  • Incorrect Recipient Address: Double-check that the recipient's email address is spelled accurately, complete, and belongs to a valid account or mailbox (phpmailer, jenkins).
  • Recipient Domain Issues: Verify that the recipient's email domain is functioning correctly, has no DNS issues, and isn't experiencing policy-based blocks.
  • Contact Recipient Administrators: If the recipient's domain has issues, their administrators might need to intervene to resolve technical problems or adjust email acceptance policies.
  • Review Email Content: Analyze the email message for potential policy violations, such as spammy content or harmful attachments, ensuring it complies with the recipient server's policies.

How to Resolve SMTP Error 546 - Step-by-Step Solution

  1. Verify Recipient Address: Ensure the recipient's email address is spelled correctly, complete, and belongs to a valid account or mailbox (phpmailer, jenkins).
  2. Check Recipient Domain: Confirm that the recipient's email domain is functioning correctly, has no DNS issues, and isn't experiencing policy-based blocks.
  3. Contact Recipient Administrators: If the recipient's domain has issues, their administrators might need to intervene to resolve technical problems or adjust email acceptance policies.
  4. Revise Email Content: Address any potential policy violations in the email message, such as removing spammy content or harmful attachments, to comply with the recipient server's policies.

SMTP Error 546 Examples

  • "546 5.1.1 recipient@example.com: Recipient address does not exist."
  • "546 5.4.5 recipient@example.com: Domain name not found. Check recipient domain."
  • "546 5.7.0 recipient@example.com: Unauthorized recipient. Email blocked due to policy reasons."
  • "546 5.1.2 Content filtering detected prohibited content in the email message. Delivery denied."

Say Goodbye to all SMTP Errors in Development

SuprSend eliminates the need to build and configure email servers from scratch, ensuring you steer clear of SMTP errors. Here's how SuprSend would work for your application, building a reliable notification system.
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Written by:
Sanjeev Kumar
Engineering, SuprSend

Say Goodbye to all SMTP Errors in Development

SuprSend eliminates the need to build and configure email servers from scratch, ensuring you steer clear of SMTP errors. Here's how SuprSend would work for your application, building a reliable notification system.
Dashboard mockup

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