Hey Guys,

We've suddenly started having problem receiving mail from one of our sister school districts. I'm trying to figure out if it's us or if it's them. All I can find in the log related to their domain are entries like this:

Code:
Apr 29 13:26:42 cottontail postfix/smtpd[23956]: connect from le-m600.llesd.k12.ca.us[149.20.82.5]
Apr 29 13:26:42 cottontail postfix/smtpd[23956]: lost connection after EHLO from le-m600.llesd.k12.ca.us[149.20.82.5]
Apr 29 13:26:42 cottontail postfix/smtpd[23956]: disconnect from le-m600.llesd.k12.ca.us[149.20.82.5]
Apr 29 14:30:07 cottontail postfix/smtpd[26091]: connect from le-m600.llesd.k12.ca.us[149.20.82.5]
Apr 29 14:30:07 cottontail postfix/smtpd[26091]: lost connection after EHLO from le-m600.llesd.k12.ca.us[149.20.82.5]
Apr 29 14:30:07 cottontail postfix/smtpd[26091]: disconnect from le-m600.llesd.k12.ca.us[149.20.82.5]
Apr 29 14:30:08 cottontail postfix/smtpd[20215]: connect from le-m600.llesd.k12.ca.us[149.20.82.5]
Apr 29 14:30:08 cottontail postfix/smtpd[20215]: lost connection after EHLO from le-m600.llesd.k12.ca.us[149.20.82.5]
Apr 29 14:30:08 cottontail postfix/smtpd[20215]: disconnect from le-m600.llesd.k12.ca.us[149.20.82.5]
Is there anywhere I can look that'll give me more details on how/why the connection was lost?

Any help would be much appreciated!