01-11-2008
SMTP Flooding - How can I stop it?
Please someone help! My SMTP server has been under attack for days and I'm at my wits end. I'm by no means a UNIX security expert but I've been reading and researching for days to no avail. I'm getting unauthorized mail from external servers being relayed or redirected through my SMTP server. The IP addresses change on almost every connection. I can post log excerpts and config file info if necessary. I just don't know what would be relevant. This is a virtual dedicated server from godaddy.com running RedHat Fedora and PLESK admin control panels. I really need help so anyone who might have any ideas or suggestions, please respond! Thanks everyone.
9 More Discussions You Might Find Interesting
1. UNIX for Advanced & Expert Users
Hi All,
I am running an email server on a Linux machine. My goal is to set up in a way that I can use pop3 to retrieve mail from a Windows machine using Outlook. Now I can download the messages from the Linux email server, however I can not send out messages. I encounter this error:
... (1 Reply)
Discussion started by: vtran4270
1 Replies
2. IP Networking
Hi,
I have a solaris 9 box, and 2 domains A.com and B.net. the machine is on B.net.
I am not able to send emails to @A.com using mail or mailx. after reading on sendmail,
there was something about relaying and editing the file /etc/mail/relay-domains.
Please let me know if this is what i... (1 Reply)
Discussion started by: 0ktalmagik
1 Replies
3. UNIX for Advanced & Expert Users
Hi ,
I have one question, suppose i am a normal user and when i use 'w' command , it shows who is logged on and what they are doing .
Now i want to stop others users to know what i am doing accept the root ?
can i do this ?
thanks (5 Replies)
Discussion started by: mobile01
5 Replies
4. Programming
how do you send a ".\n" in a smtp client?
>354 Send message, end with <CRLF>.<CRLF>
>.
>
i have already issued a "./n" but it doesnt work.
please help. thanks. (1 Reply)
Discussion started by: grotesque
1 Replies
5. AIX
Hi All,
I have a unix box which is in a network with windows machine, I am able to send the mails to the user id's with in the unix box. I dont have Internet connection for this box, so I am not able to test if it can send mails to external network or not?
I want to know, if SMTP is already... (0 Replies)
Discussion started by: balu_puttaganti
0 Replies
6. UNIX for Dummies Questions & Answers
Hi All,
I have a unix box which is in a network with windows machine, I am able to send the mails to the user id's with in the unix box. I dont have Internet connection for this box, so I am not able to test if it can send mails to external network or not?
I want to know, if SMTP is already... (1 Reply)
Discussion started by: balu_puttaganti
1 Replies
7. Red Hat
Hi all,
Please help to check weather the SMTP settings are configured or not on my LINUX server?
I want to send a mail to mailbox. I know that the target SMTP server has to be configured on LINUX box to do so.
How can i see weather it is configured or not?
--Ramesh Ch. (3 Replies)
Discussion started by: Raamc
3 Replies
8. Solaris
Hi all
I have a newly installed Oracle X2-4 server running Solaris 10 x86 with the latest patches.
I have one non-global zone configured running an Oracle DB instance.
After configuring IPMP failover between two NICs on the server and rebooting I am seeing the /var/adm/messages being flooded... (7 Replies)
Discussion started by: notreallyhere
7 Replies
9. Shell Programming and Scripting
It is crazy when you just entered a command example sudo or su or even ps. It will flood your /var/log/messages. Please see duplicate entries except for the pid. At 1 specific time.
Thanks
$ cat b
Jan 13 17:09:05 SERVER1 bash: user1 as root:
Jan 13 17:09:05 SERVER1 bash: user1 as root:
Jan... (3 Replies)
Discussion started by: invinzin21
3 Replies
LEARN ABOUT DEBIAN
net::smtp_auth
SMTP_auth(3pm) User Contributed Perl Documentation SMTP_auth(3pm)
NAME
Net::SMTP_auth - Simple Mail Transfer Protocol Client with AUTHentication
SYNOPSIS
use Net::SMTP_auth;
# Constructors
$smtp = Net::SMTP_auth->new('mailhost');
$smtp = Net::SMTP_auth->new('mailhost', Timeout => 60);
DESCRIPTION
This module implements a client interface to the SMTP and ESMTP protocol AUTH service extension, enabling a perl5 application to talk to
and authenticate against SMTP servers. This documentation assumes that you are familiar with the concepts of the SMTP protocol described in
RFC821 and with the AUTH service extension described in RFC2554.
A new Net::SMTP_auth object must be created with the new method. Once this has been done, all SMTP commands are accessed through this
object.
The Net::SMTP_auth class is a subclass of Net::SMTP, which itself is a subclass of Net::Cmd and IO::Socket::INET.
EXAMPLES
This example authenticates via CRAM-MD5 and sends a small message to the postmaster at the SMTP server known as mailhost:
#!/usr/bin/perl -w
use Net::SMTP_auth;
$smtp = Net::SMTP_auth->new('mailhost');
$smtp->auth('CRAM-MD5', 'user', 'password');
$smtp->mail($ENV{USER});
$smtp->to('postmaster');
$smtp->data();
$smtp->datasend("To: postmaster
");
$smtp->datasend("
");
$smtp->datasend("A simple test message
");
$smtp->dataend();
$smtp->quit;
CONSTRUCTOR
new Net::SMTP_auth [ HOST, ] [ OPTIONS ]
This is the constructor for a new Net::SMTP_auth object. It is taken from Net::SMTP as all other methods (except auth and auth_types)
are, too.
METHODS
Unless otherwise stated all methods return either a true or false value, with true meaning that the operation was a success. When a method
states that it returns a value, failure will be returned as undef or an empty list.
auth_types ()
Returns the AUTH methods supported by the server as an array or in a space separated string. This string is exacly the line given
by the SMTP server after the "EHLO" command containing the keyword "AUTH".
auth ( AUTH, USER, PASSWORD )
Authenticates the user "USER" via the authentication method "AUTH" and the password "PASSWORD". Returns true if successful and
false if the authentication failed. Remember that the connection is not closed if the authentication fails. You may issue a differ-
ent authentication attempt. If you once are successfully authenticated, you cannot send the "AUTH" command again.
The "AUTH" method "NTLM" is supported via Authen::NTLM (thanks to James Fryman).
SEE ALSO
Net::SMTP and Net::Cmd
AUTHOR
Alex Pleiner <alex@zeitform.de>, zeitform Internet Dienste. Thanks to Graham Barr <gbarr@pobox.com> for Net::SMTP. NTLM authentication
code provided by James Fryman <jfryman@gmail.com>
COPYRIGHT
Copyright (c) 2001, 2003, 2006 zeitform Internet Dienste. All rights reserved. This program is free software; you can redistribute it
and/or modify it under the same terms as Perl itself.
perl v5.8.8 2006-01-13 SMTP_auth(3pm)