Update - 5/10/2016, 11:00am - Yesterday's situation seems more stable than even last night and we continue to see infrequent message delays of 2-3 minutes. We are still monitoring but have no new information on the cause.
Update - 5/9/2016, 7:00pm - We are not seeing an obvious root cause of the problem. Things appear stable since
servers are no longer disconnecting but we continue to see some warnings of mail
delivery slowness. We'll continue to monitor the situation.
5/9/2016, 4:40pm - We have identified a problem with the ISC managed mail routers. The servers are intermittently dropping connections. We suspect this this behavior probably results in slowness in mail delivery but are still investigating. Please be aware that a problem with the mail routers will affect Exchange, Zimbra and PennO365 email services. We will send updates as we can.