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Comments and suggestions concerning this book should be mailed to gmourani@videotron.ca © Copyright 1999-2000 Gerhard Mourani and Open Network Architecture ® 260 improve lookup speed. If you configure your Sendmail to use a Central Server (Mail Hub) to handles all mail, you don’t need to install “aliases” and “aliases.db” files on the neighbor server or client machines. Step 1 Create the aliases file (touch /etc/aliases) and add the following lines by default: # #       @(#)aliases     8.2 (Berkeley) 3/5/94 # #  Aliases in this file will NOT be expanded in the header from  #  Mail, but WILL be visible over networks or from /bin/mail. # #       >>>>>>>>>>        The program "newaliases" must be run after #       >> NOTE >>        this file is updated for any changes to  #       >>>>>>>>>>        show through to sendmail. # # Basic system aliases -- these MUST be present. MAILER-DAEMON:     postmaster postmaster:        root # General redirections for pseudo accounts. bin:              root daemon:             root nobody:           root # Person who should get root's mail #root:            admin NOTE: Your aliases file will be  probably far more complex, but even so, note that the example shows minimum forms of aliases. Step 2 Create the aliases.db file: Since “/etc/aliases” is a database, after creating the text file as described above, you must use “makemap” program to create the database map. · To create the “aliases database map”, use the following command: [root@deep /]# makemap hash /etc/aliases.db < /etc/aliases The “/etc/mail/virtusertable, domaintable, mailertable, and virtusertable.db, domaintable.db, mailertable.db” files for the Central Mail Hub All of these files relate to particular features of Sendmail that can be tuned by the system administrator. Once again, these features are usually required only in the Central Mail Hub server. The following is the explanation of each one. The virtusertable & virtusertable.db files A virtusertable is a database that maps virtual domains into news addresses. With this feature mail for virtual domain on your network can be delivered to local, remote, or a single user address. The domaintable & domaintable.db files A domaintable is a database that maps old domain to a new one. With this feature multiple domain names on your network can be rewriting from the old domain to the new.