当你回复一封邮件时，Thunder会自动增加一个类似这样的回复头(reply header):

在2014年11月28日 1-:32, XXX写到：

当我们回复英文邮件时，这句默认添加的中文就显得有些不适合了。那么我们怎么才能修改回复头的样式呢？有两种方式：

方法一：通过修改配置

Tools -> Options -> Advanced -> General 使用Config Editor编辑配置文件。

mailnews.reply_header_type 一项的值:

Value                   Elements                                Example
0                       mailnews.reply_header_originalmessage   -------- Original Message --------
1 (SeaMonkey default)   authorwrote colon                       Alf Aardvark wrote:
2 (Thunderbird default) ondate separator authorwrote colon      On 01-01-2007 11:00 AM, Alf Aardvark wrote:
3                       authorwrote separator ondate colon      Alf Aardvark wrote, on 01-01-2007 11:00 AM:

具体说：

mailnews.reply_header_authorwrote
    Default: %s wrote
    Thunderbird replaces the %s with the author's name or e-mail address.
mailnews.reply_header_colon
    Default: : (colon)
    You can add more text here, before the colon or replacing the colon.
mailnews.reply_header_separator
    Default: , (comma space)
    You can add more text here, before the comma or replacing the comma.
mailnews.reply_header_ondate
    Default: On %s
    Thunderbird replaces the %s with the date and time.
mailnews.reply_header_locale
    Default: empty
    Optionally specify a locale for formatting the date and time—for example: en-US
mailnews.reply_header_originalmessage
    Default: -------- Original Message --------
    Changes the reply header to the text you specify if mailnews.reply_header_type is set to 0.

其中的mailnews.reply_header_locale应该可以更改时间日期格式，但实验不成功。

为了使邮件简洁，使用mailnews.reply_header_type=0。

方法二：通过安装插件

hange quote and reply format插件可以构造如下样式的reply header:

---- Original message -----
From: somebody@email_provider.com
To: you@email_provider.com
Subject: something
Date: 09/07/2007