You can use Blat for that - not only for Bootstrap but for all messages you want to have from the server.
Here it is :
Blat v1.7: WinNT console utility to mail a file via SMTP
by P.Mendes, M.Neal, G.Vollant -
syntax:
Blat <filename> -t <recipient> [optional switches (see below)]
Blat -install <server addr> <sender's addr> [-q]
Blat -h [-q]
-install <server addr> <sender's addr>: set's default SMTP server and sender
<filename> : file with the message body ('-' for console input,end with ^Z)
-t <recipient> : recipient list (comma separated)
-s <subj> : subject line
-f <sender> : overrides the default sender address (must be known to server)
-i <addr> : a 'From:' address, not necessarily known to the SMTP server.
-c <recipient> : carbon copy recipient list (comma separated)
-b <recipient> : blind carbon copy recipient list (comma separated)
-h : displays this help.
-mime : MIME Quoted-Printable Content-Transfer-Encoding.
-q : supresses *all* output.
-server <addr> : overrides the default SMTP server to be used.
-hostname <hst>: select the hostname used to send the message
-uuencode : Send (binary) file UUEncoded
-base64 : Send (binary) file using base64 (binary Mime)
Note that if the '-i' option is used, <sender> is included in 'Reply-to:'