Sendmail question

[Suporte Matik]

On Sunday 13 February 2005 22:46, Noah Davidson wrote:
> The only problem with that approach is that this is a back up server and
> the users may not be able to know of all of the users.  Is there any way to
> not have all of these bounced mail go to the postmaster / root account.
>

sendmail should reject mail for nonexistent users by default and not forward 
to root unless you have any strange alias for all but you say bounced mail 
what confuses me a little bit, but anyway, isn't it that your systema 
accounts are exploited by the spammers ? so if having 10 domains you may get 
10 spams for tty in your root mailbox, to prevent you may try this in your 
access:

tty@    ERROR:"4.2.2:450 No such user here."

and so on for each systema account and rebuild the access.db and probably your 
headache goes away

Hans



> Thanks
> Noah
>
> ________________________________
>
> From: Bill Vermillion [mailto:bv at wjv.com]
> Sent: Sun 2/13/2005 2:30 PM
> To: Noah Davidson
> Cc: FreeBSD-ISP List
> Subject: Re: Sendmail question
>
>
>
> Ashes to ashes, and DOS to DOS Noah Davidson was heard to say
>
> on or about Sun, Feb 13, 2005 at 14:10 :
> > I have set up a new FreeBSD box as mainly a backup mail server,
> > although it is primary for a couple of domains. It is running
> > sendmail 8.13.3 and it works fine, except for all the spam that
> > is being sent to it to bad email addresses. I have aliased
> > the root account to an email group on another server so that
> > someone reads the root mail. The problem is that all the mail
> > that spammers are sending to address that do not exist get
> > bounced and the root account a notification (I believe it
> > is the postmaster alias which is aliased to root). Is there
> > any way to not have these notifications sent out. They are
> > filling up the mail boxes. I just want the return to sender, but
> > not to the root / postmaster as well. I have tried using the
> > confCOPY_ERRORS_TO in my .mc file, but that just sends it to an
> > additional account as well.
>
> Making assumptions that your sendmail is receiving bogus mail
> for accounts that you have sendmail receive here is approach you
> can take.
>
> Assume you have domains  a.com b.com and c.com and your
> local-host-names has those.
>
> Then you need to find out what users you have for each domain
>
> If you have curly larry and moe on a.com and no one else, then you
> can build a virtualusrtable that looks like this.
>
> curly at a.com     curly
> larry at a.com     larry
> moe at a.com       moe
> @a.com          nouser
>
> And the accnount 'nouser' will be in your /etc/mail/aliases
> file and will look like this:
>
> nouser:  /dev/null
>
> Run make in /etc/mail to create virtusertable.db and aliases.db
> and that should get rid of the bogus names going to root.
>
> I find the virtualusertable to be quite handy for elminating a lot
> of junk.   It will only be a problem if you have a large user
> base or lots of domains.
>
> Bill
> --
> Bill Vermillion - bv @ wjv . com
>
>
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