Configuring Sendmail

I would like to present this scenario as the question:

My company has a POP3 Id.

I dial into my provider's network using PPP over a serial connection. Our  incoming mail is spooled at the provider's POP or IMAP server, while
  outgoing messages are to be sent via SMTP.  We don't have a domain
  name of our own, so everything has to use one address.

My Requirements :

  1. Sending mail between various local users must be possible.

  2. The outside world must see the local users' ISP mail addresses, not
     the local ones.

mhn_ampAsked:
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marcelvhCommented:
a good information on sendmail and different configurations can be found on the site from JUSSIEU a university in FRANCE.
they have developped a for different type of installations a very nice KIT with documentations on how work sendmail - the "KIT JUSSIEU" with some examples of configurations and a motor to recompile this configurations.
remarque:
The standard package from sendmail needs a working DNS to work. If you don' have a working dns you can recompile the source of sendmail - with NO-DNS in a .h file.
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mhn_ampAuthor Commented:
but the site is in french, i don't understand french
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marcelvhCommented:
1) there also exist a site ( in english ) that make a configuration online by answering a lot of questions. I don't remember the name, make a search on sendmail it must be easy to retreive.
2) for jussieu, don't be afraid with the french language, the kit is easy to use : there is a lot of preconfigure files - you must only change some parameters that are local with the yours - and the makefile will do all the job.
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marcelvhCommented:
if you run X-window with KDE you can also use Ksendmail a nice graphical tool to configure sendmail
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