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Re[2]: sendmail user masquerading



Ira Abramov <lists-linux-il@ira.scso.com> wrote:
>  On Tue, 11 Jan 2000, Ohad M. Somjen wrote:
>  
>  > hi,
>  > i'm trying to configure sendmmail.
>  > got it up and running, i use fetchmail to get the mail and sendmail to
>  > deliver it locally. now the problem is that when i send mail it does not
>  > rewrite the FROM so i get an illegel mail address that no one can reply to
>  > - or worse, someone else will get the answer.
>  
>  it is not the job of the MTA to fix the MUA's overlooks.

IMO, tuning a (single) MTA is better than configuring each and every MUA for
each and every user. But more important is, that many MTA simply refuse to talk
to a peer with no valid DNS entry.

>   fix the client
>  and you should be fine. do not attempt to fix the sendmail.cf unless you
>  have a 10 day vacation from work coming.

Actually, it's rather simple using the m4 macros (the default way of configuring
sendmail these days). The .mc file should contain

MASQUERADE_AS(your.isp.provider.domain)
FEATURE(allmasquerade)
FEATURE(masquerade_envelope)

This should be enough if the local usernames coinside with those @isp.
Otherwise, one should use the genericstable feature.

Regards,

Evgeny


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