Dear All, Here are the details for my Exch_Servers: Back-End Server IP: 10.10.33.5/24 G.W: 10.10.33.7 Front-End Server LAN1 LAN2 IP: 10.10.33.15/24 IP 212.100.215.1/29 Connected directly to ADSL modem G.W 10.10.33.7 G.W : no gateway 10.10.33.2 ISA1 Server 10.10.33.7 ISA2 ISP Domain abc.com ISP Domain xyz.com 2 Domains Authentication on Both Servers Front-end Exchange Server: Default Web Site:Basic Authentication ExAdmin: Integrated Authentication Exchange:Basic Authentication ExchWeb:Anonymous Active Sync:Basic Authentication OMA:Basic Authentication (note: Default domain must be \) Public:Basic Authentication. Back-end Exchange Server: Default Web Site:Anonymous, Integrated Authentication ExAdmin: Integrated Authentication Exchange:Integrated Authentication, Basic Authentication ExchWeb:Anonymous Active Sync:Basic Authentication OMA:Anonymous, Integrated Authentication Public:Anonymous, Integrated Authentication. Now Emails are going/coming successfully unless some small but head each problems which are: <!--[if !supportLists]-->1- <!--[endif]-->I can Sent/Rcvie emails on both domains but cant sent emails to some particular domains. <!--[if !supportLists]-->2- <!--[endif]-->Can access OWA but cant attach any file and cant sent emails; even cant c any email in inbox. <!--[if !supportLists]-->3- <!--[endif]-->Restrict some users but still user are rcving emails from outside, Is there some 1 who can help me out plz. Regards