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My qmail queue is filling up with what looks like spam emails to yahoo and hotmail accounts. These are not being sent by any of the domains listed in rcpthosts. How can I find out the ip of the person doing this and block them? <br />
I have cleared the queue and tried killall qmail-remote but the q will soon start to fill up again.<br />
I have also tried telnet relay-test.mail-abuse.org and it appears that any email containing the server hostname is allowable. I also need to stop this.<br />
Thanks.
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My qmail queue is filling up with what looks like spam emails to yahoo and hotmail accounts. These are not being sent by any of the domains listed in rcpthosts. How can I find out the ip of the person doing this and block them? 
I have cleared the queue and tried killall qmail-remote but the q will soon start to fill up again.
I have also tried telnet relay-test.mail-abuse.org and it appears that any email containing the server hostname is allowable. I also need to stop this.
Thanks.

Looks like my qmail server is being used to send spam

Within Internet message handling services (MHS), a message transfer agent or mail transfer agent (MTA) or mail relay is software that transfers electronic mail messages from one computer to another using a client–server application architecture. A MTA implements both the client (sending) and server (receiving) portions of the Simple Mail Transfer Protocol (SMTP). The terms mail server, mail exchanger, and MX host may also refer to a computer performing the MTA function. The Domain Name System (DNS) associates a mail server to a domain with mail exchanger (MX) resource records containing the domain name of a host providing MTA services.