[CentOS] sendmail security-with example

[Feizhou]

> In above example u can see in the 1st example the
> sender(xyz) is not real user of my domain , still he
> is able to sendmail to my real users (abhi).

> 
> plz help me.

abhishek singh,

The simplest way that I can think of is to create a database of your 
addresses and then check the mail from against that database and reject 
if not found.

The problem is how to maintain that database.

You could add a table lookup for this database and then add rules in 
Local_check_mail to check mail from: addresses against the database.