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/opt/zimbra/libexec/zmproxyconfig -e -w -o -a 8080:80:8443:443 -x both -H `zmhostname`

Lalu 

zmprov ms `zmhostname` zimbraReverseProxySSLToUpstreamEnabled FALSE`

lalu

zmtlsctl both
zmprov ms `zmhostname` zimbraReverseProxyMailMode both
zmprov ms `zmhostname` zimbraMailMode both
zmcontrol restart