Spam hitting 97% observed from 1 week and it is at regular intervals. my domain is xyz.com.
All these mails have sender address (from:) mail.xyz.com and receipt to unknown mail ID's.
WEA is dropping the messages at gateway level. but i want that mails should not hit my IRONPORT box at all.
Note: All mails have source DNS same and Sender IP address varies.
Help me in reducing the mails.