LESSON 10
Date: 4/9/2009
Email Basics
Linux for Engineering and IT applications
Open Relay
Spammers try to find mis-configured SMTP servers:
Allow relay to trusted hosts/subnets only:
mynetworks = 127.0.0.0/8 192.168.5.0/24
Alternatively, you can allow authenticated user relay
Basic Steps of Email Transaction
Composing and Sending Email
Email Envelope and Headers
Popular Unix SMTP servers
IMAP and POP servers
Example of POP3 session
Example of IMAP session
SMTP and DNS
Basic Postfix Settings
Open Relay
Relaying e-mail to the outside of NAT
Steps to Protect Email Server on the Internet
Practical Exercises
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