We are configuring Cisco CWMS Server version 2.6 for internal and external meeting (50 user deployment) we have an issue with sending email invitation to external user only internal user receive the meeting invitation external user do not receive it although we checked the mail server and we normally can send email to those external user with no issue but when the CWMS is sending invitation to those user ithey do not receive it,no firwall between the mail server and the CWMS the reside in the inside LAN on the Firewall and the IRP resides in the DMZ.
I appreciate your support,
Regards,karim