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Special Forums Cybersecurity how to hide the IP in the email header? Post 7217 by Neo on Thursday 20th of September 2001 11:34:15 PM
Old 09-21-2001
It is not a just a matter of spoofing the sending IP. SMTP is based on TCP which is connection oriented. The exploit most commonly used is when one or more intermediate SMTP relays are used to relay the mail combined with dirty tricks in the SMTP protocol exchange.

I agree with PxT that there are not too many defensible scenarios to send anonymous email or mask the originating machine. The potential for abuse may far outweigh the benefit for good.
 

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mailto.conf(5)							    Apple Inc.							    mailto.conf(5)

NAME
mailto.conf - configuration file for cups email notifier DESCRIPTION
The mailto.conf file defines the local mail server and email notification preferences for CUPS. Each line in the file can be a configuration directive, a blank line, or a comment. Comment lines start with the # character. DIRECTIVES
Cc cc-address@domain.com Specifies an additional recipient for all email notifications. From from-address@domain.com Specifies the sender of email notifications. Sendmail sendmail command and options Specifies the sendmail command to use when sending email notifications. Only one Sendmail or SMTPServer line may be present in the mailto.conf file. If multiple lines are present, only the last one is used. SMTPServer servername Specifies a SMTP server to send email notifications to. Only one Sendmail or SMTPServer line may be present in the mailto.conf file. If multiple lines are present, only the last one is used. Subject subject-prefix Specifies a prefix string for the subject line of an email notification. SEE ALSO
classes.conf(5), cupsd(8), cupsd.conf(5), mime.convs(5), mime.types(5), printers.conf(5), http://localhost:631/help COPYRIGHT
Copyright 2007-2009 by Apple Inc. 12 July 2006 CUPS mailto.conf(5)
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