cf/README for sendmail 8.12.3Eric Allman of the Sendmail Consortium
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Non-SMTP Based Configurations
These configuration files are designed primarily for use by SMTP-based sites. They may not be well tuned for UUCP-only or UUCP-primarily nodes (the latter is defined as a small local net connected to the rest of the world via UUCP). However, there is one hook to handle some special cases.
You can define a ``smart host'' that understands a richer address syntax using:define(`SMART_HOST', `mailer:hostname')
In this case, the ``mailer:'' defaults to "relay". Any messages that can't be handled using the usual UUCP rules are passed to this host.
If you are on a local SMTP-based net that connects to the outside world via UUCP, you can use LOCAL_NET_CONFIG to add appropriate rules. For example:
define(`SMART_HOST', `uucp-new:uunet') LOCAL_NET_CONFIG R$* < @ $* .$m. > $* $#smtp $@ $2.$m. $: $1 < @ $2.$m. > $3
This will cause all names that end in your domain name ($m) to be sent via SMTP; anything else will be sent via uucp-new (smart UUCP) to uunet. If you have FEATURE(`nocanonify'), you may need to omit the dots after the $m. If you are running a local DNS inside your domain which is not otherwise connected to the outside world, you probably want to use:
define(`SMART_HOST', `smtp:fire.wall.com') LOCAL_NET_CONFIG R$* < @ $* . > $* $#smtp $@ $2. $: $1 < @ $2. > $3
That is, send directly only to things you found in your DNS lookup; anything else goes through SMART_HOST.
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