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mailer(8) John mailer(8)


Mailer - notify users about crackable passwords


mailer <password-file>


mailer is a script to send mail to all users whose passwords got cracked. This is not always a good idea, though, since lots of people do not check their e-mail or ignore such messages, and the messages can be a hint for crackers.

You should probably deploy proactive password strength checking, such as with passwdqc, before you ask users to change their passwords - whether using this script or otherwise. And you should edit the message inside the script before possibly using it.

Copyright (c) 1996-98 by Solar Designer # Redistribution and use in source and binary forms, with or without # modification, are permitted. # There's ABSOLUTELY NO WARRANTY, express or implied. # (This is a heavily cut-down "BSD license".) #


The file containing all the passwords (for example /etc/shadow on modern Linux systems.




John the Ripper password cracker is free and Open Source software. Copyright (c) 1996-98 by Solar Designer.

This manual page was written by Lars Vogdt for the openSUSE operating system (but it may be freely used, modified, and redistributed by others).

October 2013 Lars Vogdt