Server hacked and used for Spamming :( Some help pls.

Hello,

recently my server has been hacked and used for spamming...
I have already disabled the mail server and also any relaying but then it still happened and now I have a super huge Mail Queue.

Is there any way to remove all the messages from the "mailq" ? And after that block some specific users from sending out emails totally?

Because I think if they use a php script the mails would still be sent.

Thanks for the help.

 

 

 

 

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