Smart Table (sendmail)

Abstract

The document describes how to make sendmail select smart host (e-mail relay host) based on envelope sender address (full address or domain part only).

Usage

In smarttable file you can put entries like the ones given below:

test@mike.com.hk lesspopular.mailhub.com
@mike.com.hk     popular.mailhub.com
test@domain.pl   uucp:nodex
test@domain.us   esmtp:[smtp.domain.us]:my.isp
# relay for <> sender [version 8.2+ of smarttable]
@                relay:smtp.myisp.com

lesspopular.mailhub.com will be used to relay messages send from test@mike.com.hk. Messages from remaining addresses in mike.com.hk will be relayed via popular.mailhub.com. You can also specify mailer used as shown in the remaning lines.

smarttable development and maintanance has been moved to open-sendmail at sourceforge.net.

Install

Create /etc/mail/smarttable file and compile it using makemap.
Copy provided smarttable.m4 file into cf/feature directory.
Use "Save as" command in your browser. In some cases "copy and paste" looses required info (e.g. tabs - \t)
In *.mc file you use to generate sendmail.cf add:
```
  FEATURE(`smarttable')dnl
```
and generate new sendmail.cf or sendmail-test.cf.

Tests

You can use commands given below for testing the feature:

sendmail -C sendmail-test.cf -bt <<END
3,0 recipient@test.com
.Dfsender@sender.domain
3,0 recipient@test.com 
END

Additional

smarttable uses sender addresses befere masquerading (e.g. genericstable rewrite).
smarttable is not consulted for deliveries to addresses in local email domains
mailertable is consulted before smarttable
DO NOT use feature/smarttable.m4 pre 8.5 releases
- versions 8.2-8.3 were newaliases unfriendly
- versions 8.1-8.4 routed local address with no domain part via smarttable
Another solution for sender based smart host selection has been proposed by Neil Ricket. HACK(`sender_based_routing') is available at http://www.cs.niu.edu/~rickert/cf/

Original Posting

First smart table post
Subject: Re: How to relay the mail according to the sender domain
Date: 1999-02-05
Newsgroups: comp.mail.sendmail
Message-ID: <36BB38E3.A2F8C332@polbox.com>