check_smtp - Invalid SMTP response received from host

[James Bond]

Hi AllFor a few hours a day off and on, I get the following warning from "check_smtp -H xx.xx.xx.xx" command running on the main Nagios host:"Invalid SMTP response received from host""SMTP WARNING - 0.005 sec. response time|time=0.004907s;;;0.000000"During this problem, if I run the same command on machine xx.xx.xx.xx, it returns:SMTP OK - 0.005 sec. response time|time=0.005030s;;;0.000000This affects only one machine out of many.Any ideas appreciated.TIA, Nick 
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