How to Set Up a Local Mail Alias File

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Compile a list of each of your users and the locations of their mailboxes.
Become an administrator on the mail server.
For more information, see Using Your Assigned Administrative Rights in Securing Users and Processes in Oracle Solaris 11.4.
Add the following entries to the /etc/mail/aliases file:
- An entry for each user
```
user1: [email protected]
```
  user1
  
  Use the new alias name
  
  [email protected]
  
  Use the actual address for the new alias
- A Postmaster: root entry
```
# cat /etc/mail/aliases
..
Postmaster: root
```
- An alias for root using the mail address of the person who is designated as the postmaster
```
# cat /etc/mail/aliases
..
root: user@host.example.com
```
  user@host.example.com
  
  Use the assigned address of the designated postmaster
Rebuild the alias database.
```
# newaliases
```
The configuration of the –AliasFile option in /etc/mail/sendmail.cf determines whether the command generates either a single file, /etc/mail/aliases.db, or a pair of files, /etc/mail/aliases.dir and /etc/mail/aliases.pag.
Perform one of the following steps to the file or files that are generated.
- Copy the /etc/mail/aliases, the /etc/mail/aliases.dir, and the/etc/mail/aliases.pag files to the /etc/mail directory of each of the other systems.
- Copy the /etc/mail/aliases and the /etc/mail/aliases.db files to the /etc/mail directory of each of the other systems.
  You can copy the file or files generated by rsync command. For more information, see the rsync(1) man page. Alternatively, you can create a script for this purpose.
  
  When you copy these files, you do not need to run the newaliases command on each of the other systems. However, you must update all the /etc/mail/aliases files each time you add or remove a mail client.