# Hardening the Postfix
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## Goals
* Mitigate the problem
* Sanitizate the sender

## The problem
Imagine you have a Linux server running Postfix like Mail Transfer Agent. Your domain has very users. It's fair that anyone have a weak password. If any spammer/cracker has access to it, he can send message like any user in this domain.

EXAMPLE

My domain has three users(USER A, USER B and USER C). The USER B and USER C have a strong password. But, the USER A's password is very, very weak: "abc123". Because him the MTA is vulnerable, now a malicious SPAMMER can send spam impersoneted like USER A, USER B, USER C and any user in this domain.