If you suspect hackers have abused your server to send email without your knowledge, we have tools to help you clean up the server and help prevent the same issue from happening again.
The tools you can use depend on your operating system, control panel, and MTA (Mail Transfer Agent). If we don't have tools for your server's configuration, we recommend looking for other resources.
We recommend ensuring your relays are closed. For more information, see Testing Your Server for Open Relays.
cPanel has the following information to help you find problems on your server:
Inmotion® Hosting has the following documents for those using Exim:
Depending on which MTA you use, Parallels has documentation for finding the domains running spam scripts on your server:
Both MTAs can use the following documentation: The server is saturated with SPAM. There are many messages in the queue. The mail is sent slowly.
MailEnable has the following documentation: How to clear the queues if a spammer abuses the server.