Just wanted to post this b/c I spent alot of time looking into why remote ZCO users were getting way more items put into Junk than others...
What eveybody has said about fixing this is correct:
-turn off X-Originating-Ip in the admin console
-add remote site to the MTA trusted network list
My issue was I was doing that but still getting a DOS_OUTLOOK_TO_MX=2.845
It wasn't until I actually looked into /opt/zimbra/conf/salocal.cf and saw that my trusted networks where being listed per line:
Exactly the way I had put them into the BOX in the MTA trusted networks area of the Admin client... Its a box.. so I entered one per line....
Wasn't until I sepreated networks by a space, saved and did a:
did the networks appear correctly in salocal.cf
and THAT fixed my problem....
trusted_networks 126.96.36.199/24 188.8.131.52/24 184.108.40.206/24