[COLUG] Exim4 Recipient Whitelisting (solved)

[Dave Maxwell]

On Sat September 22 2007, Dave Maxwell wrote:

> What I need to do is simply give Exim4 a list of valid recipients.  I could
> then reject mails to non-existent recipients at SMTP connection time.  It
> is a small business with low turnover and having small text file on the
> Exim4 side of valid recipients is an entirely practical means to deal with
> this.

After much head scratching and Google shaking,  I found the following 
basically solves my problem.  rcpt_accept.txt has one valid recipient per 
line like so:

user1 at example.com
user2 at example.com

Any mails to users not explictly in that list are rejected at SMTP connection 
time which means the brain dead Exchange 2000 not-so-smarthost can't be used 
to bounce spams off of.

         recipients = lsearch;/etc/exim4/rcpt_accept.txt
         verify = recipient/callout

I hope this helps somebody sometime.

Dave

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