You suspect that you are receiving messages with a forged From: address. What could help you find out where the mail is originating?
A. Install TCP wrappers, and log all connections on port 25
B. A dd the command ‘FR-strlog’ to the sendmail.cf file
C. Add the command ‘define (‘LOG_REAL_FROM’) dnl’ to the sendmail.mc file
D. Run a filter in the aliases file that checks the originating address when mail arrives
E. Look in the ReceiveD. and Message-ID. parts of the mail header
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