Hi,
We are receiving this bounce back from this one particular external domain.
smtp;550 No RDNS entry for 175.a.x.141
our mx : mail.x.shm.com = 175.a.x.140
our ptr : 175.a.x.140 = mail.x.shm.com
175.a.x.141 is our WAN 1 interface of the firewall.
Why does the external domain reject the RDNS.
knizam