We could not resolve the DNS hostname you provided to an IP address to attempt a connection. This is a critical problem.
This is only possible if you specified a hostname to test against. If you know the IP address of your mail server you can run the test using the IP to bypass this error, however doing so will mask a real problem with your DNS.
Additional Information
You should perform a DNS Lookup to ensure you have an A record mapping your hostname to the correct IP address for your server. You may also use our DNS Check tool to make sure your DNS servers are up and running properly.
Your Email Deliverability is in Jeopardy!
Blacklisting is a sign that you are not actively managing your email deliverability. Other technologies - SPF, DKIM and DMARC are now just as important to get your email placed in the Inbox of your recipients. If you aren’t managing email deliverability, your message may never be heard.
MxToolbox Delivery Center Features:
- Insight into your SPF, DKIM and DMARC configuration to ensure your sending email properly
- DMARC Compliance checks for all of your reported email
- Adaptive Blacklist Monitoring of all your email senders
- Recommendations for improving DMARC compliance and DMARC policies
- Event-based reminders for emergent issues and on-going maintenance
DMARC is a necessity for your business!
Learn More about Email Delivery