I have a DNS configuration issue related to email delivery. Specifically, I have set up two MX records, one for domain.com and another for sub.domain.com.
However, when sending an email from domain@domain.com to domain@sub.domain.com, the message does not get delivered properly. I'm not sure what might be causing this problem. Can anyone offer any guidance or suggestions?

It's important to properly configure your email servers in order for mail to be delivered successfully. One way to do this is by determining the locations of your mail servers and installing them accordingly. However, it's possible that you may be encountering more than one issue.

For example, if you are able to receive emails at domain@sub.domain.com and send emails from that address without issue, but cannot receive emails at domain@domain.com, the problem likely lies with the settings of your mail servers rather than with your MX records. Have you checked your mail server configurations to ensure they are set up correctly? This may be a good place to start troubleshooting.

Properly configuring your email servers is crucial for successful email delivery. It's important to determine the location of your email servers and install them appropriately. While issues with MX records may be a factor in mail delivery problems, there could be other underlying issues to consider.

For instance, if you are able to send and receive emails to and from sub.domain.com without any issues, but cannot receive emails at domain.com, the root cause of this problem may lie with your mail server settings rather than with your MX records.
Before investigating your MX settings, ensure that your mail servers are properly configured. This may help you identify the source of the problem and take steps to rectify it.

It seems like there might be an issue with your DNS configuration. One possible reason for the email delivery problem could be that the MX records are not correctly set up for the subdomain.

To troubleshoot this, here are a few steps you can follow:

1. Verify MX Records: Make sure both domain.com and sub.domain.com have separate MX records pointing to the correct mail servers. Double-check if the priority values are correctly set.

2. Check DNS Propagation: Ensure that the DNS changes have propagated properly. It might take some time for the changes to propagate across all DNS servers.

3. Test Email Delivery: Test sending emails from domain@domain.com to other domains and vice versa. This will help determine if the issue only occurs when sending to the sub.domain.com.

4. Examine Email Headers: Analyze the email headers of the undelivered emails. Look for any error codes or specific information that might indicate the cause of the problem.

5. Check Mail Server Settings: Verify that the mail server handling sub.domain.com is correctly configured to accept incoming emails for that subdomain.

What kind of problems can occur with mx records in DNS.
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