block external domain

[ocbineesh]

hello,

recently i installed Zimbra CS6 in RHEL5. when i connect internet, users are sending mails to external domain like gmail. how i can block sending mails to external domain.

in my server there is two domains like @abc.com and @xyz.com. i want to restrict users to send mail to their domain members only.

[uxbod]

Restrict sending to certain domains - Zimbra :: Wiki