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Resolve DSN Service unavailable error in Sendmail

Have you been having trouble with the “DSN Service Unavailable” error message in Sendmail?

This message often means that the mail server we are trying to send email through is unresponsive. This may be because it is busy, down, or it has a network connectivity issue. Additionally, the error may also occur if the email server’s Domain Name System (DNS) is not configured correctly, thereby preventing Sendmail from resolving the server’s hostname.

Fortunately, our experts have put together the following troubleshooting tips to help you out:

1. First, check the status of the email server we are trying to send emails through. We have to check if it is running and accepting connections.
2. Next, ensure the DNS records for the email server are accurate and up-to-date. We can use the nslookup command to find the server’s hostname and IP address and verify that the details match the expected values.
3. Then, we have to check the firewall and network settings to verify there are no blockages that will prevent Sendmail from accessing the email server.
4. Now, we have to check if Sendmail is configured correctly with the right email server settings. Furthermore, re-check the smart host or relay host settings, and verify they are pointing to the correct email server.
5. Finally, analyze the Sendmail log files for further information about the error. This will help us pinpoint the root cause behind the issue.

The above troubleshooting tips will help us resolve the “DSN Service Unavailable” error in Sendmail. Let us know in the comments if you need further help with this error.

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Conclusion

In summary, our Support Techs demonstrated how to resolve DSN Service unavailable error in Sendmail.