09-19-2001
Quote:
Originally posted by eddie
We buy dial-up accounts just for getting Internet connections.
Exactly. Whether or not you use the ISP's mail server is irrelevant. You are using their dial-up (or broadband) connection, and are therefore bound by their AUP.
Quote:
What reports the IP of my sendmail server to the recipients server? Sendmail daemon? Does the recipients server resolve the IP form the network packets (Network Layer of OSI)?
Yes. At some point the sending machine has to contact a recipient machine to send the message. Whether or not you have inserted your own fake headers at this point is irrelevant. When you make a connection to the recipient the recipient appends the connecting IP to the headers. You can hack your outgoing packets to include a fake source address if you like, but in that case you will have to use SMTP blind -- i.e. sending without ever seeing the responses to your commands.
Quote:
If we have to change something at the network layer to spoof the IP, I would like to give up.
You need access to raw sockets, which generally means root privileges. Unfortunately its not that hard to do. See nmap for example.
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LEARN ABOUT SUSE
calibre-smtp
CALIBRE-SMTP(1) calibre CALIBRE-SMTP(1)
NAME
calibre-smtp - part of calibre
SYNOPSIS
calibre-smtp [options] [from to text]
DESCRIPTION
Send mail using the SMTP protocol. calibre-smtp has two modes of operation. In the compose mode you specify from to and text and these are
used to build and send an email message. In the filter mode, calibre-smtp reads a complete email message from STDIN and sends it.
text is the body of the email message. If text is not specified, a complete email message is read from STDIN. from is the email address
of the sender and to is the email address of the recipient. When a complete email is read from STDIN, from and to are only used in the SMTP
negotiation, the message headers are not modified.
Whenever you pass arguments to calibre-smtp that have spaces in them, enclose the arguments in quotation marks.
OPTIONS
--version
show program's version number and exit
-h, --help
show this help message and exit
-l, --localhost
Host name of localhost. Used when connecting to SMTP server.
-o, --outbox
Path to maildir folder to store failed email messages in.
-f, --fork
Fork and deliver message in background. If you use this option, you should also use --outbox to handle delivery failures.
-t, --timeout
Timeout for connection
-v, --verbose
Be more verbose
COMPOSE MAIL
Options to compose an email. Ignored if text is not specified
-a, --attachment
File to attach to the email
-s, --subject
Subject of the email
SMTP RELAY
Options to use an SMTP relay server to send mail. calibre will try to send the email directly unless --relay is specified.
-r, --relay
An SMTP relay server to use to send mail.
--port Port to connect to on relay server. Default is to use 465 if encryption method is SSL and 25 otherwise.
-u, --username
Username for relay
-p, --password
Password for relay
-e, --encryption-method
Encryption method to use when connecting to relay. Choices are TLS and SSL. Default is TLS.
SEE ALSO
The User Manual is available at http://calibre-ebook.com/user_manual
Created by Kovid Goyal <kovid@kovidgoyal.net>
calibre-smtp (calibre 0.6.53) July 2010 CALIBRE-SMTP(1)