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List:       exim-users
Subject:    Re: Address re-writing in Exim
From:       Richard Gilbert <R.Gilbert () sheffield ! ac ! uk>
Date:       1997-08-28 16:59:32
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> I'm comverting our MTA service from PP to Exim and have managed
> to overcome most of the cultural differences.
> 
> There's One thing I haven't quite managed to sort out -
> 
> Our MTA is a hub for the entire site, and addresses are re-written
> in the form 'Initial(s).Surname@lmu.ac.uk' as they pass through
> the MTA. This worked OK in PP and is fine in Exim.
> 
> A feature of our PP configuration is that addresses which do not
> exist in the tables cannot EMail out of this site. The most 
> useful result of this feature is that badly formed return addresses
> are not let out of the site.
> 
> With Exim, I'm not sure how to achieve the same thing - what
> I really want is for Exim to return/dump any EMail which contains
> an originator's address which cannot be rewritten.
> 
> Has anyone else done this ?
> 
> Any ideas gratefully received - please could you reply directly
> to me as I'm not (yet) a member of this list.

This reply may be too late to be of interest -- I have just returned from
holiday.

I wanted to do the same thing and nobody suggested anything better than
what I came up with myself.  I use a pair of rewriting rules (which can be
compressed into one at the cost of much longer strings in the database):

*@*.shef.ac.uk  ${lookup{$2}lsearch{/var/spool/exim/tables/rewrite_hosts}\
                {$1@$2.rewrite}fail}    bcfrF
*@*.rewrite	${lookup{${lc:$1}@$2}dbm{/var/spool/exim/tables/invaliases}\
                {$value}{unknown@sheffield.ac.uk}}      bcfrF

The first checks to see whether the host is one for which rewriting is
required; if so it maps user@host.shef.ac.uk to user@host.rewrite.  The
second rule looks up the string user@host to find the
I.Surname@sheffield.ac.uk form but returning unknown@sheffield.ac.uk if
the lookup fails.  With sender_verify set this address fails as required. 

Richard
--
Richard Gilbert
Corporate Information and Computing Services
University of Sheffield, Sheffield, S10 2TN, UK
Phone: +44 114 222 3028   Fax: +44 114 222 3040

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