Re: [exim] Am I Hacked?

Rick Lutowski schrieb:

>> Here is a way to send spam from your server:
>> telnet mail.jreality.com 25
>
> Interesting! telnet per se is not running
> on the server. This must be a telnet buried
> in exim. Is this correct?

No. This is the way internet email is sent. It's what your mail client
does (it connects to port 25 of your server and sends the commands you
have seen Graeme send), and you can do that yourself, manually, using
telnet, of course.

Most internet protocols (SMTP for mail, HTTP for requesting webpages,
...) are working that way in plain text; your clients (your mail
client, your web browser) are not doing some kind of magic, but rather
sending and receiving commands to and from the server. You can use
telnet - not just to login to a shell running on your server, but to
"speak" SMTP or HTTP - to do that by hand.

-thh