Mercury の設定

http://side-b.sto.co.jp/weblog/archives/224
http://d.hatena.ne.jp/sutara_lumpur/20100617/1276728122

C:\xampp\apache\bin\php.ini

[mail function]
; For Win32 only.
; http://php.net/smtp
SMTP = localhost
; http://php.net/smtp-port
smtp_port = 25

Gmail のsmtpサーバを利用する場合は　
[mail function]
; For Win32 only.
; http://php.net/smtp
SMTP = smtp.gmail.com
; http://php.net/smtp-port
smtp_port = 587

-----
phpでsendmail を 利用したい場合には、以下の「;」を外す。
;sendmail_from = postmaster@localhost
;sendmail_path = "\"C:\xampp\sendmail\sendmail.exe\" -t"

; For Win32 only.
; http://php.net/sendmail-from
;sendmail_from = postmaster@localhost

; For Unix only.  You may supply arguments as well (default: "sendmail -t -i").
; http://php.net/sendmail-path
;sendmail_path = "\"C:\xampp\sendmail\sendmail.exe\" -t"

; Force the addition of the specified parameters to be passed as extra parameters
; to the sendmail binary. These parameters will always replace the value of
; the 5th parameter to mail(), even in safe mode.
;mail.force_extra_parameters =

; Add X-PHP-Originating-Script: that will include uid of the script followed by the filename
mail.add_x_header = Off

; Log all mail() calls including the full path of the script, line #, to address and headers
;mail.log = "C:\xampp\apache\logs\php_mail.log

参考URL
http://blog.magical-remix.net/urame/archives/370