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<TITLE>The Answer Guy 45: Virtual E-mail Domains</TITLE>
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<H4>"The Linux Gazette...<I>making Linux just a little more fun!</I>"</H4>
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<H4>By James T. Dennis,
<a href="mailto:answerguy@ssc.com">answerguy@ssc.com</a><BR>
LinuxCare,
<A HREF="http://www.linuxcare.com/">http://www.linuxcare.com/</A>
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<H3 align="left"><img src="../../gx/dennis/qbubble.gif"
height="50" width="60" alt="(?) " border="0"
>Virtual E-mail Domains</H3>
<p><strong>From Netvigator on Fri, 20 Aug 1999
</strong></p>
<!-- ::
Virtual E-mail Domains
~~~~~~~~~~~~~~~~~~~~~~
:: -->
<P><STRONG>
Dear Answerguy,
</STRONG></P>
<P><STRONG>
I recently install RH6 and use linuxconf to add virtual email
domain as well as POP3 account. I test it with sending email to
that virtual email domain and sucessfull without returning
mail. However, I cannot retrieve mail using POP3. Can you give me
any idea about that ? (The DNS setup is OK since the Web virtual
domain can function properly).
</STRONG></P>
<P><STRONG>
Regards
</STRONG></P>
<BLOCKQUOTE><IMG SRC="../../gx/dennis/bbub.gif" ALT="(!)"
HEIGHT="28" WIDTH="50" BORDER="0"
>
When you send mail to the account into which
you are funneling this virtual e-mail domain traffic,
is the spool file created under <TT>/var/spool/mail/?</TT>
</BLOCKQUOTE>
<BLOCKQUOTE>
Is it a normal mbox file (a text file with a series of
e-mail messages concatenated together, delimited by lines
of the form <tt>^From ....*</tt>)?
</BLOCKQUOTE>
<BLOCKQUOTE>
Does your POP daemon work for any of your other accounts?
</BLOCKQUOTE>
<BLOCKQUOTE>
What mail client are you using? Does '<tt>fetchmail</tt>' work
when you use it to fetch your POP mail from localhost?
</BLOCKQUOTE>
<BLOCKQUOTE>
Are there any messages in <TT>/var/log/messages</TT> that might be
related to any of this?
</BLOCKQUOTE>
<BLOCKQUOTE>
You'll have to at least isolate the problem to the MTA (mail
transport agent, presumably <tt>sendmail</tt>) or the MSA (mail
storage agent: presumably UW's IMAP/POP3 daemon package), or
the client/delivery agents (<tt>procmail</tt>, <tt>fetchmail</tt>,
or whatever you're using).
</BLOCKQUOTE>
<BLOCKQUOTE>
Once you've isolated a problem down to the relevant
subsystem you can then work on isolating it to a specific
operation. Is your POP3 daemon being started by TCP
wrappers, tcpd (almost certainly)? Is tcpd preventing the
access from your client (quite a common problem)?
</BLOCKQUOTE>
<BLOCKQUOTE>
The fact that this is being done through <tt>linuxconf</tt> doesn't
offer me any clues. I've only played with linuxconf very
briefly, and so far I don't like it and wouldn't trust it
to set up a virtual e-mail domain.
</BLOCKQUOTE>
<BLOCKQUOTE>
Is it generating a <tt>.mc</tt> file for sendmail? I don't want to
see a <tt>sendmail.cf</tt> --- those are too long and too tedious to
read. However, if the mbox file(s) are being properly
created under <TT>/var/spool/mail</TT> as you expect then you don't
need to worry about the MTA at all.
</BLOCKQUOTE>
<BLOCKQUOTE>
Incidentally, the fact that your virtually hosted web server
works doesn't actually eliminate the possibility of DNS
problems. It could be that you have MX records pointing to
never-never-land. Those would take precedence over the
A records (which are all that are required for web browsers
to resolve your server's IP address).
</BLOCKQUOTE>
<BLOCKQUOTE>
Try doing a bit of troubleshooting to isolate the
symptoms in more detail. That will probably make the
problem more clear and suggest a solution.
</BLOCKQUOTE>
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<H5 align="center"><a href="http://www.linuxgazette.com/ssc.copying.html"
>Copyright ©</a> 1999, James T. Dennis
<BR>Published in <I>The Linux Gazette</I> Issue 45 September 1999</H5>
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