Sendmail not verifying User

[Stephen Swaney]

> -----Original Message-----
> From: MailScanner mailing list [mailto:MAILSCANNER at JISCMAIL.AC.UK] On
> Behalf Of MailScanner Mailbox
> Sent: Monday, May 31, 2004 6:58 PM
> To: MAILSCANNER at JISCMAIL.AC.UK
> Subject: Sendmail not verifying User
>
> Hello All
>
> We are running:
>
> Solaris 9
> Sendmail 8.12.11
> MailScanner 4.29.7
> SpamAssassin I forget
>
>
> It seems as though when sendmail is in queueonly mode it does not check to
> see if the recipient is a valid user. It appears to read the virtusertable
> file as well as the access database and will act on those but not the
> password file.
>
>
> We accept mail from the outside world on two different machines and
> forward them off all shiney and sparkly to a 3rd machine for pickup by our
> members using the mailertable feature on the queue runner.
>
> We do not get a user unknown error until the queue runner tries to deliver
> to the internal machine. If the machine is not in queueonly mode then
> unknown recipients are rejected immediatley.
>
> This is not a new problem, it has been happening since the get go, I just
> have a lil spare time to try and get this solved.
>
> Any thoughts or ideas would be most appreciated.
>

This has been discussed at length recently and it's not that difficult to
implement. If your using sendmail please read the techniques used at:

http://www.sng.ecs.soton.ac.uk/mailscanner/serve/cache/270.html

We've used these techniques very successfully with Exchange, Domino and
POP/IMAP backend mail hubs.

The trick is simply:

1. Build a list on the gateway of valid email addresses in the form:

user at somedomain.com     user at mailhub.somedomain.com

This can done using LDAP queries, scripts, or even manually. We usually
build this list automatically using a cronjob.

2. Configure sendmail to use the list as outlined at the link above.

Steve

Stephen Swaney
President
Fortress Systems Ltd.
Steve.Swaney at FSL.com
> Thx
>
> Rick Noble
>
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>
> Fortress Systems Ltd.
> www.fsl.com
>



--
This message has been scanned for viruses and
dangerous content by MailScanner, and is
believed to be clean.

Fortress Systems Ltd.
www.fsl.com

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