Hello I have an exchange 2010 server and somebody is sending mail from it to send SPAM, if i look the queue I have some mails without sender "<>".
And If the mail is correct, the name source message is "FromLocal" and if the mail is SPAM the name source message is DSN
Are there any computer, iphone or ipod infected and sending SPAM?
Is my exchange used to resend SPAM?
Can I prevent to send mail FROM "DSN" or without mail direcction?