What Is Causing This Error?
The 540 error is an SMTP response that occurs on sites sending emails through an SMTP server. It indicates that the From email address has a missing or non-existent DNS server.
This can occur if the domain part of your email (e.g., @example.com) doesn’t exist or the DNS record isn’t properly configured.
Resolving the Error – Solution
Before proceeding, we recommend verifying that you’re using the correct email address. A minor typo or missing letter in the From email address could lead to email-sending issues.
Since this error usually relates to your site’s DNS settings, try the following to fix the error.
- Wait for DNS Propagation: DNS changes can take up to 48 hours to fully propagate. If you recently made any change to your site’s DNS, we suggest waiting and retrying after a while.
- Check DNS Configuration: Domain names usually come with DNS records containing settings specific to the domain. One of these records is the MX record, which contains email settings. If your site isn’t properly configured, you’ll likely encounter the error 540 issue.
We suggest reviewing your DNS settings to ensure you’re not missing a required record. Contact your domain host if you need help accessing or verifying your DNS records.
That’s it! Now you know the causes of the SMTP 540 error and how to resolve it.
If you’d like to learn how to learn how to troubleshoot other common errors, check out the following tutorials: