I tried using the mail command on one of our Linux machines to send email, and it works fine. I tried using the same command on another one of our Linux machines, and it didn't work (no error message was returned either).
The machine that works has the following version information:
The machine that does not work has the following version information:
Can anyone tell me where I might look to see why the one machine can't send email? What configuration files I might want to look at? Thanks.
hi,
i just finished installation solaris 8 on my unix machine. i want to setup a mail server on it ( i assume it has not had one yet).
so, what is my first step? where can i find out step by step configuration procedure on web ? so any expert is willing to teach me?
pls help me.
... (1 Reply)
Hi,
I have a desktop on which linux is installed. It is connected to office LAN. I am able to send mails(using the 'mail' command) to anybody who is connected to the linux machine. But I am not able to send mails to internet IDs. Please inform, what do I have to do to enable mailing to internet... (3 Replies)
I basically want to login into different linux machines( on the same network) from a windows machine. I know i can use ssh <machine name>. But i want to automate this process. I dont want to enter the username and password. Is there any way to do it. Can i make some sort of a batch script for it. (4 Replies)
I need a shell script to copy files frm a linux machine to a windows machine using SCP. The files keeps changing day-to-day. I have to copy the latest file to the windows machine frm the linux machine.
for example :In Linux, On July 20, the file name will be 20.txt and it should be copied to... (3 Replies)
HI All,
I am facing the problem with rmail ...
Actually my server is linux environment Redhot server.
To send a mail which command I have to use it . I want subject and I want to Include CC also
And body of the mail also there . But If I use rmail command it is not taking any options to... (1 Reply)
I have a requirement to check whose accounts are expired in Linux machine and send a mail to root user about the accounts. How can i achieve this in Linux? (1 Reply)
I have windows XP machine.
Today i have tried to install Cygwin, I've downloaded all the packages then ran the setup. It's showed completed.
But when i try to open this it's not working.
Do i need to do anything extra for this..?
Please help... (3 Replies)
Hi
I am working on linux machine and swap command is not working Linux Machine
On Solaris machine it is working fine:
uname -a
SunOS rgsm01 5.9 Generic_118558-03 sun4u sparc SUNW,Sun-Fire-V440
swap -s
total: 6596320k bytes allocated + 1035968k reserved = 7632288k used, 38893408k available
... (5 Replies)
Hello,
I have a problem.
I have a server SPARC T3-1 with solaris 11 on the base. The server is working well. And then i did a virtual machine using again Solaris 11 to do this, but now my notwork on my virtual machine is not working anymore. There says that the network that i have created is... (11 Replies)
Discussion started by: keziacp
11 Replies
LEARN ABOUT ULTRIX
forgeries
forgeries(7) Miscellaneous Information Manual forgeries(7)NAME
forgeries - how easy it is to forge mail
SUMMARY
An electronic mail message can easily be forged. Almost everything in it, including the return address, is completely under the control of
the sender.
An electronic mail message can be manually traced to its origin if (1) all system administrators of intermediate machines are both coopera-
tive and competent, (2) the sender did not break low-level TCP/IP security, and (3) all intermediate machines are secure.
Users of cryptography can automatically ensure the integrity and secrecy of their mail messages, as long as the sending and receiving
machines are secure.
FORGERIES
Like postal mail, electronic mail can be created entirely at the whim of the sender. From, Sender, Return-Path, and Message-ID can all
contain whatever information the sender wants.
For example, if you inject a message through sendmail or qmail-inject or SMTP, you can simply type in a From field. In fact, qmail-inject
lets you set up MAILUSER, MAILHOST, and MAILNAME environment variables to produce your desired From field on every message.
TRACING FORGERIES
Like postal mail, electronic mail is postmarked when it is sent. Each machine that receives an electronic mail message adds a Received
line to the top.
A modern Received line contains quite a bit of information. In conjunction with the machine's logs, it lets a competent system administra-
tor determine where the machine received the message from, as long as the sender did not break low-level TCP/IP security or security on
that machine.
Large multi-user machines often come with inadequate logging software. Fortunately, a system administrator can easily obtain a copy of a
931/1413/Ident/TAP server, such as pidentd. Unfortunately, some system administrators fail to do this, and are thus unable to figure out
which local user was responsible for generating a message.
If all intermediate system administrators are competent, and the sender did not break machine security or low-level TCP/IP security, it is
possible to trace a message backwards. Unfortunately, some traces are stymied by intermediate system administrators who are uncooperative
or untrustworthy.
CRYPTOGRAPHY
The sender of a mail message may place his message into a cryptographic envelope stamped with his seal. Strong cryptography guarantees
that any two messages with the same seal were sent by the same cryptographic entity: perhaps a single person, perhaps a group of cooperat-
ing people, but in any case somebody who knows a secret originally held only by the creator of the seal. The seal is called a public key.
Unfortunately, the creator of the seal is often an insecure machine, or an untrustworthy central agency, but most of the time seals are
kept secure.
One popular cryptographic program is pgp.
SEE ALSO pgp(1), identd(8), qmail-header(8)forgeries(7)