Upgrade for Live Support

All of our paid plans come with access to our highly experienced technical support team.

  • Contact us via Email, Phone, or Ticket
  • Detailed Explanation of Your Lookup Results
  • Guidance to Help Resolve Your Problems
  • RFC Compliance Best Practices
  • Blacklist Delisting Support

Let our experts help you resolve your smtp issue!

Get Smtp Support

SMTP Connection Time

What you see when your domain has this problem
Connection timeout Details area Ignore

More Information About Smtp Connection Time

We were able to connect to your mail server on port 25, but the connection took much 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

Are you confident your email is getting through?

You rely on email for business critical communication, so you need to know your email has been delivered to your customers and you need to know who is sending email on your behalf.

MxToolbox is YOUR expert on email deliverability. MxDelivery Center analyzes your DMARC, DKIM and SPF to give you the insight you need to make email configuration changes and get your emails to your customer's inboxes.
Learn More