Rockliffe

Rockliffe develops secure email server software for carriers, telcos, service providers, enterprises and businesses worldwide. Rockliffe was established in 1995 and is based in California's Silicon Valley with European headquarters in the UK. Rockliffe has more than 2,000 customers hosting more than 15 million mailboxes worldwide. These include service providers such as Active24, Verizon, eChalk, Sabancy and WestNet, and enterprises such as Teleflora, Encyclopdia Britannica, and MediaNews Group. Rockliffe partners include HP, Qualcomm, J2, Enigma Health, Rockwell Collins, Kaspersky, Mailshell and Fidelity.

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AstraChat - Direct XMPP Client
Free
AstraChat is a lightweight standalone Jabber (XMPP) client application that connects directly to your XMPP server without any proxies...
Android
StealthChat: Private Messaging
Free
StealthChat is a secure app for calling and chatting with your friends and partners.
Android
MailSite Collaborator SE
Trial version
Block viruses and spam messages from accessing your server.
Windows

Rockliffe

AstraChat - Direct XMPP Client

StealthChat: Private Messaging

MailSite Collaborator SE