What Is Causing This Error?
SMTP error 542 often indicates an issue with your SMTP server, leading to emails being rejected. It occurs when there is a bad connection between the SMTP server and the recipient’s email client.
This error can occur due to a variety of reasons. The most common causes include:
- Poor IP address reputation
- Incorrect security settings
- Unsupported security protocols
Resolving the Error – Solution
Troubleshooting this error can be a bit tricky since it can occur due to various reasons. However, reviewing each of the potential reasons could narrow it down.
Improving IP address/domain reputation: If the sender’s domain or IP address has a poor reputation, you’ll need to take steps to improve it. One way to do this is by adding the required SPF, DKIM, and DMARC records for your domain.
Configure security settings: Check and confirm that your SMTP server is configured to meet the requirements set by the recipient’s email server.
Use the right security protocols: Some email servers require specific SSL/TLS settings. Ensure your SMTP server uses the correct protocol to route emails.
That’s it! Now you know the causes of SMTP error 542 and how to resolve it.
If you’d like to learn how to troubleshoot other common errors, check out the following tutorials: