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  • Blacklist Delisting Support

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SMTP Transaction Time

What you see when your domain has this problem
Long Transaction Time Details area Ignore

More Information About Smtp Transaction Time

We were able to connect to your mail server on port 25, but the diagnostic session took longer than expected. This could indicate that your email server is under heavy load.

Here are the levels for which we issue warnings and alerts:

  • Over 5 Seconds: Warning
  • Over 8 Seconds: Alert

Having this warning on your lookup does not necessarily mean that you will have a problem receiving mail. It is simply a warning that things are less than optimal. This could end up causing users to experience delays with inbound mail.

Additional Information

Tarpitting

It is also possible your server is “Tar pitting.” Tar pitting is a technique used by some email servers to slow down spammers. The idea is that legitimate senders will wait longer to establish a connection than spammers will.

Here is a link to a link to the TechNet article with more information about Tarpitting

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

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