Setting Up Sendmail

Setting Up a Sendmail Mail Server

Virtual email really means to setup a server to receive email from multiple domains
and deliver it to single end users or user groups who are associated with those domains.

Example:
We could configure the server to receive email to the following domain:

bogus25.com

Then, we would set up users who are to receive this email on the local system.

Steve
Chris
Tina

Those three users are associated with the above domains in different ways. Lets give
each person a responsibility......

• Steve:
  • He is to receive email concerning sales on the domain bogus25, so we give him the
    email address: sales@bogus25.com
• Chris:
  • Is the owner of the company, and only answers email from his personal friends,
    so we give him: chris@bogus25.com
• Tina:
  • Is the technical person, she is to get ALL other email to the domain bogus25.com so by
    default she gets ALL other addressed email. (billing, feedback, info, whatever) Her email
    address is special in that it is "Wild Carded" which means she will get any email addressed
    to the bogus25.com domain that has not been specifically assigned to another user.
    This is her "Internal" email address: @bogus25.com

How to Set it Up:

Step 1

Add the users you wish to have email services to your server Give username and password.
In our example above, the command sequence would be:

adduser chris
passwd chris
adduser tina
passwd tina
adduser steve
passwd steve

Step 2

Open webmin (sendmail.cw) Add the domain: bogus25.com to this file.

Edit /etc/mail/virtusertable Add the following email address to username map to this file:

sales@bogus25.com steve
chris@bogus25.com chris
@bogus25.com tina

Have someone or send yourself some test emails to you at the new accounts.

Another thing to check... All mail is stored inside /var/spool/mail. Any user receiving
mail should have a file inside that directory named the same as their username.
Are the files there? Are they 0 filesize? When you send test messages to the domains,
do the files grow? To watch the mail as it arrives, you may use the following command:

tail -f /var/spool/mail /username

(again with this command, press ctrl-c to stop)

To add more domains, repeat the following steps appending new information to each file.