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I am running SBS 2008, using MXtool Box to reslove DNS issue its showing they 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.<br />
Here are the levels for which we issue warnings and alerts:<br />
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Over 5 Seconds: Warning<br />
Over 8 Seconds: Alert<br />
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.<br />
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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<br />
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What can be done about this?
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I am running SBS 2008, using MXtool Box to reslove DNS issue its showing they 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.

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


What can be done about this?

SMTP  - 9.173 seconds - Not good! on Transaction Time

The Microsoft Legacy Operating System topic includes legacy versions of Microsoft operating systems prior to Windows 2000: All versions of MS-DOS and other versions developed for specific manufacturers and Windows 3/3.1, Windows 95 and Windows 98, plus any other Windows-related versions, and Windows Mobile.

Microsoft Legacy OS

The Domain Name System (DNS) is a hierarchical, globally distributed system responsible for associating the name of a computer, service or other resource into an IP address for connecting to the Internet or a private network. Most prominently, it translates domain names to the numerical IP addresses needed for the purpose of computer services and devices worldwide.

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