background: Xeams as front for incoming and outging filter,real mail server exchange behind Xeams.

For example,the spammer's really valid contact email is: xxxxx@gmail.com ,for incoming email,it maybe at Disposition-Notification-To or Reply-To，the SMTP FROM is from xxxx@sendgrid.net，mailgun or some other, If need to filter it,maybe i will add Disposition-Notification-To or Reply-To contains xxxxx@gmail.com,asign a score.

If it is not filter then go to exchange,and there is reading receipt,it will send email to xxxxx@gmail.com,in order to block emails,maybe i will add TO,CC,BCC contains xxxxx@gmail.com,asign score.

Is there any function to check the whole email headers,as long as it contains: xxxxx@gmail.com,then asign a score,no matter it it at From: To: CC: Disposition-Notification-To: Reply-To and etc.