Chapter 14. SMTP (e-mail)
In this chapter we will cover some of the more common SMTP issues, including sending/receiving mail from the firewall, forwarding SMTP traffic to an internal mail server, and dealing with special circumstances to keep in mind when firewalling SMTP servers.
Common Questions
Can iptables/netfilter alert via e-mail? | |
Natively, no, it cannot. There are numerous ways to add in alerting capabilities with user space tools such as the IDS snort (http://www.snort.org). | |
Can firewall rules be used to route traffic based on the recipient? | |
The short answer is no. The (very) long answer is yes, but you would need to use something like iproute2 (ftp://ftp.inr.ac.ru/ip-routing/) or an application layer proxy. It is also possible to ... |
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