postfix/error: B80DD3282855: to=<firstname.lastname@example.org>, relay=none, delay=0.09, delays=0.07/0.01/0/0.01, dsn=4.4.2, status=deferred (delivery temporarily suspended: lost connection with server.mydomain.com[ip.ad.dr.ess] while sending end of data -- message may be sent more than once).
My Zimbra OE 7.1.0 got lost connection to lmtp many time after upgrade to last version 7.1.0. It running on Red Hat KVM assigned 4 cored and 8GB of memory Estimated user about 700 users.
I've tried to fine parameter of each modules. last thing is reduce connection of lmtp from postfix only 1 session.