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DanRaposoFlag for United States of America

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How to check response time for sendmail when issued an SV (sender verification) challenge.

Is there a simple way to time your mail server reposnse time?  Specifically I am trying to figure out if a mail server is responding with in a 2-second window provided by verizon's sender verification setup.
In other words.  If I send an email from to will relay the message to a sender verification pool of mail servers.  This pool will send a message to my server asking if the username exists.  If it does not get a reposnse in two seconds it will not accept the message and return a 450 error.

Any thoughts would be greatly appreciated.  The mail server is sendmail and it is running a greylisting program called relaydelay.
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Arty K
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