Q. How do I allow receiving email from my own domain only? I am using Qmail mail server software under Fedora Core Linux.

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A. You can change the behavior of the qmail system by modifying qmail’s control files. This is essential as you do not want to become a source of open mail relay. By default qmail will not relay. However every persons need is different. You can force qmail to accept domain listed rcphosts file only.

Open file /var/qmail/control/rcpthosts

# vi /var/qmail/control/rcpthosts

And append your domain name to accept email. Here is my sample file from my own box:

nixcraft.com
cyberciti.org
cyberciti.biz
theos.in
gite.in

Save the file. And restart qmail.

From the qmail man page, “Allowed RCPT domains. If rcpthosts is supplied, qmail-smtpd will reject any envelope recipient address with a domain not listed in rcpthosts. Exception: If the environment variable RELAYCLIENT is set, qmail-smtpd will ignore rcpthosts, and will append the value of RELAYCLIENT to each incoming recipient address. rcpthosts may include wildcards:
.nixcraft.com

Envelope recipient addresses without @ signs are always allowed through.”