On 19 Sep 2014, torys.anderson@gmail.com wrote:

> << full contents of email.so >>
> -------------------------------
> #!/bin/sh
> # emacs-mailto-handler
>
> mailto=$1
> mailto="mailto:${mailto#mailto:}"
> mailto=$(printf '%s\n' "$mailto" | sed -e 's/[\"]/\\&/g')
> emacs_server="server"
> elisp_expr="(mailto-compose-mail \"$mailto\")"
>
> /usr/bin/emacsclient -a "" -c -n -s "$emacs_server" --eval
> 	"$elisp_expr" \ '(set-window-dedicated-p (selected-window) t)'

This is the small script that I have been using with Firefox's mailto
handler for years with no problems: