I am getting this reply in when I try to send out.
"550 The host name specified in HELO does not match IP address"
I am unsure but we are getting allot of bounce back message from company and sometimes it turns out that we need to white-list them or tell them to white-list us.
If I run a Mxtoolbox on our domains it says:
SMTP Reverse DNS Mismatch Warning - Reverse DNS does not match SMTP Banner...
Also we do not have a SPF record setup (do we really need this)?
Thank you any help is appreciated.
We are using Exchange 2010 with Forefront
Domains is gallery.ca