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Hi Guys,<br />
<br />
I am facing a serious problem, recently we have migrated to zimbra opensource edition in our organization. Everything went so well and the management is so happy. But recently a requirement came up to restrict all our employees on the zimbra server emailing to some random accounts (people of have unsubscribed for our regular emails).<br />
<br />
Can someone please guide me on how this can be achieved ? We are using Zimbra Version 8.5.<br />
<br />
Thanks.
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Hi Guys,

I am facing a serious problem, recently we have migrated to zimbra opensource edition in our organization. Everything went so well and the management is so happy. But recently a requirement came up to restrict all our employees on the zimbra server emailing to some random accounts (people of have unsubscribed for our regular emails).

Can someone please guide me on how this can be achieved ? We are using Zimbra Version 8.5.

Thanks.

Restrict Emails to external email accounts (external receipients)

Within Internet message handling services (MHS), a message transfer agent or mail transfer agent (MTA) or mail relay is software that transfers electronic mail messages from one computer to another using a client–server application architecture. A MTA implements both the client (sending) and server (receiving) portions of the Simple Mail Transfer Protocol (SMTP). The terms mail server, mail exchanger, and MX host may also refer to a computer performing the MTA function. The Domain Name System (DNS) associates a mail server to a domain with mail exchanger (MX) resource records containing the domain name of a host providing MTA services.

Email Servers

Linux is a UNIX-like open source operating system with hundreds of distinct distributions, including: Fedora, openSUSE, Ubuntu, Debian, Slackware, Gentoo, CentOS, and Arch Linux. Linux is generally associated with web and database servers, but has become popular in many niche industries and applications.

Linux

Interactions between email servers and clients are governed by email protocols. The three most common email protocols are POP, IMAP and MAPI. Most email software operates under one of these (and many products support more than one).  The correct protocol must be selected, and correctly configured, if you want your email account to work.