[ale] internal vs external mail

[Gary Maltzen]

For reference, I'm running 8.10.x where as 'teller' appears to be running
8.9.3 so file locations may be slightly different

~~
To configure sendmail to allow relay from local hosts

  sendmail.cf contains a line of the form

    Kaccess hash /etc/mail/access

  and /etc/mail/access contains something like

    192.168 RELAY

~~
To configure sendmail to use 'local' delivery for internal users

  sendmail.cf contains multiple lines of the form

    Cw localhost
    Cw external.domain.one
    Cw internal.domain.one
    Cw internal.domain.two

  (each member of class 'w' is considered a local domain)

~~
To configure sendmail to use a canned name

  sendmail.cf contains a line of the form

    Djsomehost.somedomain.com

  (note that the reverse IP lookup must succeed)

~~
For reference, there is little difference between an incoming MTA connection
and an incoming MUA connection; they both have to talk SMTP.

  <- Server identification
  -> HELO my.hostname.is
  <- 200 OK
  -> MAIL FROM: joker at metropolis.gov
  <- 250 OK
  -> RCPT TO: batman at thecave.org
  <- 250 OK
  -> DATA
  <- 250 OK last line contains single period
  -> message header stuff
  -> blank line
  -> message body stuff
  -> .
  <- 250 OK message accepted for delivery
  -> QUIT
  <- 250 OK see ya around

~~
Reading Costales & Allman's "Sendmail" is why I know this stuff...
(not to mention -quite- a few misconfigurations)

> I am trying to setup sendmail to support both internal and external mail.
> The connection is dialup to mindspring. They will bounce mail if it lacks
> a valid reverse-lookup (a good thing, spam killer) and they don't forward.
>
> The problem is this: fetchmail grabs from pop3.mindspring. Secratary has
> to filter and forward to internal addresses as needed. mail client
> (eudora, arrrgghhh) can only use one smtp server to send from. Right now
> they can use either internal mail, or external mail. Not both.
>
> I need a way to have sendmail handle only the mail to local accounts and
> pass along all the rest and have it look as if it comes from a mail
> client so it can get pass the reverse-lookup problem with Mindspring.
>
> O'Reilly's Sendmail is a hard read.


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