netMailshar 

netMailshar is an easy-to-use, powerful mail server that enables every computer in an office to send and receive email not only across the Internet but also within a LAN. It provides centralized, generic protection against all email viruses.
mail server email gateway multiple emailboxes intranet mailing multiple accounts smtp pop3 email monitoring email archiving email filter mtx protection anti-virus kak

ReachPlus Alerts 

tekAlign's ReachPlus Alerts is used to send instant safety alerts, emergency messages, network-wide popup messages, network alerts and critical notifications.
alert alerts alert users broadcast messages broadcast network alerts emergency alerts emergency notification instant alerts instant network alerts network alerts network messaging network-wide alerts

Trusted Messenger 

Effective communications for the office. Converse with colleagues in real time. Messages can be sent to any network users through their network user name or computer name, messages can be sent to all network users simutlaneously with a single click.
instant messenger instant messaging network messaging secure messaging chat chat program instant messaging software lan chat instant network communication network communication messenger instant messenger