Rewrite From: header to match actual sender

Problem with having this option on is that it tries to rewrite your mailservers hostname EG root.mydomain.com when delivering messages from root. Shouldnt it only be trying to rewrite messages headers that a considered email addresses? eg user@*? EG [quote] 2019-01-20 00:03:01 1gl84L-003r2L-RR From: header (rewritten was: [root@cp.mydomain.net], actual sender is not the same system user) original=[root@cp.mydomain.net] actual_sender=[efast@cp.mydomain.net] 2019-01-20 00:03:02 1gl84L-003r2L-RR => efast R=localuser T=dovecot_delivery C="250 2.0.0 APCCNzUrRFxbBQ4A1ioWhA Saved" 2019-01-20 00:03:02 1gl84L-003r2L-RR Completed