:group 'message-headers
:type 'regexp)
-(defcustom message-ignored-supersedes-headers "^Path:\\|^Date\\|^NNTP-Posting-Host:\\|^Xref:\\|^Lines:\\|^Received:\\|^X-From-Line:\\|Return-Path:\\|^Supersedes:"
+(defcustom message-ignored-supersedes-headers "^Path:\\|^Date\\|^NNTP-Posting-Host:\\|^Xref:\\|^Lines:\\|^Received:\\|^X-From-Line:\\|^X-Trace:\\|^X-Complaints-To:\\|Return-Path:\\|^Supersedes:\\|^X-Trace:\\|^X-Complaints-To:\\|^NNTP-Posting-Date:"
"*Header lines matching this regexp will be deleted before posting.
It's best to delete old Path and Date headers before posting to avoid
any confusion."