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- Special routing
- Introduction
-
- _S_e_n_d_m_a_i_l will normally transmit email message directly to the destina¡
- tion host using SSMMTTPP (standard email protocol over TCP/IP). This is
- sometime inappropriate. You may want to "manually" override some deci¡
- sion made by Sendmail.
-
- 11.. DDiiffffeerreenntt rreeaassoonnss ffoorr ddooiinngg ssppeecciiaall rroouuttiinngg..
-
- There are many technical reasons why one would want to take control
- over _S_e_n_d_m_a_i_l normal behavior. Here are some.
-
- ╖ The destination host is not reachable from your computer. Your
- computer is behind a firewall.
-
- ╖ The DNS of the destination host is buggy or incomplete (No valid MX
- record).
-
- ╖ The host is reachable by uucp only. You get this situation when one
- has a valid domain, but no direct connection to the _I_n_t_e_r_n_e_t. Your
- computer might be the designated Mail eXchanger for this domain. As
- such, it will receive all email for this domain. It will need a
- special rules to forward the messages properly.
-
- ╖ You have a better (less expansive, faster, ...) route to this host
- than the default one.
-
- 22.. ttaasskkss
-
- You may have many special rules. Each rules contain the following
- information.
-
- DDeessttiinnaattiioonn
- This is the destination domain you want to control.
-
- ffoorrwwaarrddeerr
- This is the host which will receive (and retransmit) the
- messages for the destination domain. The forwarder can be a
- fully qualified name or a UUUUCCPP name depending on the mailer used
- to reach that forwarder.
-
- MMaannaaggee ssuubb--ddoommaaiinn iiddeennttiiccaallllyy
- This rule may apply to a destination domain and all
- machines/sub-domain under it. Note that you may select this
- option and still provide another special routing for one
- host/sub-domain of this domain. This rule will take precedence
- over this option.
-
- mmaaiilleerr
- You pick the mechanism which must be used to reach the
- forwarder.
-
- 33.. FFiilleess
-
- The rules are stored in the file /var/lib/mailertable. The utility
- /usr/sbin/makemap is used to create an indexed database out of this
- file. _L_i_n_u_x_c_o_n_f take care of this any time you save the rules.
-
-