Sendmail - Multiple Domains, One Box - Blocking One Or Two Domains

itemprop="text">

I have a number of domains hosted at a
web hosting service. They use sendmail to handle incoming email. I have six domains on
this service (which we can call aaa.com, bbb.com and so on). Each email account has the
same name and one email box. In other words, tango@aaa.com, tango@ccc.com, tango@fff.com
and all the others go into one box, /var/spool/mail/tango, where my email program on my
desktop picks it up.

I have done very little
work in sendmail. I haven't had to, and I've been warned it's a steep learning curve.
But now I'm running into an issue. I was in a business situation where, for years, my
email address was on the website for aaa.com. (We won't go into why this was necessary -
it wasn't my preference and it's in the past.) Now I'm using tango@ddd.com instead of
tango@aaa.com.

I was getting about 1,000 or more
pieces of spam a day, but SpamAssassin and my own email program caught about 75% of
that. (Which still left stuff to delete.) Now, after checking, I see that 90% or more
goes to tango@aaa.com, the one that was on the web for
years.

I'd like to deactivate tango@aaa.com and
possibly tango@bbb.com and tango@ccc.dom, but want to keep using tango@ddd.com.
Remember, email to tango at any of these domains will go into one email
box.

I've had people tell me that
sendmail can be configured so I can deactivate tango@aaa.com (and other domains) and
still use tango@ddd.com (and others, if I want to). In other words, I can configure
sendmail to use this account on some domains and not others. One of the people who was
teling me this was in tech support at the hosting
service.

But I wrote to tech support with a work
order to do this and now I'm told it can't be
done.

I can modify config files myself on this
account if needed, but I was hoping to just let them do it. (I love delegation -- it
means I spend more time doing my stuff.)

Is it
possible to keep an email account active on one domain and not others with sendmail,
when all domains are hosted on the same server? Is there a name for this process or
setting? Any information would be helpful - either pointers to instructions so I can do
it, or enough info so I can tell tech support, "This is where to look, and it can be
done, so please pass my request on to someone who works with sendmail and knows how to
do it."

Is this something sendmail can
do?

itemprop="text">

class="normal">Answer

You need
to enable rel="nofollow noreferrer">FEATURE(virtusertable) in your sendmail.mc. Next
you have to execute three
steps:

1. Rebuild sendmail.cf
   using the command appropriate for your
   operating
   system.



2. Next you need to
   edit your virtusertable with the following
   entries:

   
   
   

   tango@aaa.com error:550
               user
               unknown
   




3. Rebuild
   the virtusertable database and restart sendmail. On Debian and Ubuntu systems this is
   done by executing
   sendmailconfig