I have exchange server 2010 server installed almost all email are going out but some of outgoing giving below error
450-4.7.1 Client host rejected: cannot find your reverse hostname, [213.42.xx.xxx]
400 4.4.7 Message delayed
450-4.7.1 Client host rejected: cannot find your reverse hostname
My dns server is managed by ISP and I have configured Mapped IP in Juniper SSG 140 which is pointing external ip to internal ip of exchange server.
I have checked email header which is giving ip address of firewall and not my exchange server external IP.
Please help me resolve this issue as soon as possible how can I change ip address or configuration of firewall or exchange to external ip address of exchange server?