以下摘自Debian邮件列表 http://lists.debian.org/debian-user/2004/04/msg10991.html I found out how to get rid of the on the fly, automagic adjusting of the word wrap in plain text emails. I knew it was called flowed format but I wasn't sure how to turn it off. Yes, I am aware of the advantages it offers, but it also makes me look like an idiot when posting to the mailing lists. So I added these two lines to my prefs.js file: user_pref("mailnews.display.disable_format_flowed_support", true); user_pref("mailnews.send_plaintext_flowed", false);