Red Hat / Fedora :: IP Sending Spam Via Squid Server

Oct 16, 2010

I just saw that my network is slowed so I watches the /var/log/squid/access.log where I get this line continuously....

[Code]....

I thought that someone running any script so I disconnect all my LAN connection (simply removed the local lan cable) but I saw the connections is going on....so I watch the processes on proxy server but nothing suspicious....So I change my static IP and the spamming stops (I say it is spam b'coz the IP 203.188.197.10 is of yahoomail.com ) but I when I am putting my OLD ip back the connection starts again......I want to put back my old static IP b'coz I have configured it for many services. Is there any spyware on my machine or someone configured my IP?

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Server :: Sending Spam To The Spam Folder?

Apr 30, 2009

I just setup SpamAssassin and what not following this tutorial

[URL]

I am using CentOS 5.3. I was half way through that and got an email that had ***SPAM*** in the subject. Haven't received any more. First of all I want to know if spam will still get delivered, and just have a modified subject. Second, I want to know how to set it up so Spam goes to a user's spam mailbox (Virtual Users). And third of all, is it possible to disable spam filtering on a user basis, preferably using MySQL tables? Is it possible for users to mark a message as spam, and all further messages sent from that address will be sent to spam folder but only for that user?

EDIT: Yes spam is getting delivered with a modified header, on the server site, how can i deliver to spam folder? how to create IMAP virtual mailboxes on request without having to send an email to them first? Using virtual users with Courier Imap

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Jul 3, 2011

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My guess is that they are trying to send it by accessing a webmail. Have you heard of anything like that? how to block spam?

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Mar 4, 2011

The mail server keeps getting locked up with tens of thousands of spam emails.So, i followed some instructions similar to this : [URL]I can clear the queue spams, easy, but after an hour or so the server is dead again.. not receiving emails and not sending out emails.

Code:

Received: (qmail 356 invoked by uid 509); 4 Mar 2011 21:39:10 +0800
Received: from 125.110.124.51 by host1.wemotor.com (envelope-from <oiazfkdvd@yahoo.com.tw>, uid 508) with qmail-scanner-1.25-st-qms
Received: from unknown (HELO 202.46.116.119) (125.110.124.51)

[code]....

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Jun 17, 2010

i am using centos 5.4, running squid for proxy, i want to block email sending and receiving of proxy users to secure my data. how is it possible that the proxy user can only brows websites but he can not receive or open and send or save as draft to mail box.

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Nov 18, 2010

We have a spam in our network and we installed antivirus in all our systems and cleaned the virus from all pc's after that i had removed my ip from the database of blocked ip's but still my ip is blocked for sending spam i don't know from which pc the spam is going on the internet.

so i have a question that my proxy server is redhat linux and as a newbie i don't know the command's to find out which pc is creating large bandwidth to the internet. If you tell the command how to see which pc is sending spam then i will discard that pc. Also i want a strong firewall to stop spam activities.

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Aug 25, 2009

I currently have the following email server set up:

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Dovecot
clamav
spamassassin
amavisd

And it all works great. However I would like it for amavisd to forward all the marked spam into a folder on each user account, but I cannot figure this out.

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Apr 25, 2010

I want to setup a Linux Fedora based Anti-Virus & Anti-Spam Server on my LAN. I have more than 60 Windows users with Proxy Squid running on LAN. Our Email server is hosted on the Internet. Because of virus/spam generate problem, emails are worst affected & the users have a lot of problem on Email, as the outlook gives error. It happens when a PC generates Spam & our IP gets blocked by the ISP for some time. Thats why I want to setup an Anti VIRUS/SPAM Firewall on my LAN (before the Squid), so these spams do not go past the Internet Gateway.Hope u guys understand my problem & suggest some useful links, software & documentations.

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May 23, 2010

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Jan 17, 2011

I would like to ask some help and tutorial for setting up and how to configure squid proxy server in my (Home PC Server). I am a newbie in Linux Centos. I already installed in my system the CentOS 5.5 . Now, I want to configure it as my internet server, all of my 4 system running in Windows including the laptop I want to connect through my CentOS pc with username authentication. I assign all IP address by static. see tthe attachement in my set up. [url] I just want to know what I need to change and add in my squid config file. And how can I configure properly my CentOS with 2 LAN card as internet server.

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Mar 8, 2010

How to configure my home linux server, as an email server, and be able to send email to hotmail, please?. I have done this before, but I never managed to do it so hotmail accept emails coming from my linux server.

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Jul 27, 2011

I am using postfix as spam Mailscanner to protect my mail server running sendmail. The problem is that when I forward an email from MailScanner mail me back with the following error:

<postmaster@localhost.@mydomain.com.>... Real domain name required for sender address (in reply to MAIL FROM command))
Jul 27 13:15:59 smtp postfix/local[28465]: C68AC1000001: to=<root@smtp.mydomain.com>,

[code]....

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Aug 16, 2010

After installing postfix on my server , all emails sent by a PHP class that i built , are received to spam folder , no matter what i do .am not an expert , except in PHP , the class i built works fine everywhere else except on this server , so i think the problem might be from the server it self ?some told me wrong configuration/software on my server , others told me wrong DNS stuff . actually i don't understand the DNS stuff , and am not an expert in linux softwares and services but i cann install/configure them , so could anyone please check the DNS for problems ?

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Jul 25, 2011

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Apr 16, 2010

Amavis-new on my mail server is marking my emails as spam, like so:

Quote:

Apr 16 12:15:52 myserver amavis[30979]: (o3GIFltt008868) Blocked SPAM, AM.PDP-SOCK [xx.xx.xx.xx] [xx.xx.xx.xx] <myemail@mydomain.com> -> <myfriend@hisdomain.com>, quarantine: spam-w1hxRn9Pr4P6.gz, Message-ID: <4BC8A9E8.2070108@mydomain.com>, mail_id: w1hxRn9Pr4P6, Hits: 7.844, size: 6763, 1986 ms

The mail server is not on my local LAN, and all the primary users are roaming. They connect via TLS auth, which is required to make a sendmail connection to my server. I could whitelist all addresses in my domain, but then anyone spoofing my email wouldn't be seen as spam. How do I simply tell amavis-new and/or sendmail not to spam scan TLS authenticated users?

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Jan 7, 2009

I am working happily with Fedora 8, evolution chatting happily to exchange 2003, calendar sync the works...impressed. This continued through Fedora 9 (though a little bumpy as all odd numbered Fedora releases are). On to Fedora 10, yes works a treat out of the box (DVD). A couple of updates to evolution later, through yumex (fedora updates), and evolution has stopped sending email to the exchange server. It's also touch and go whether I can read email using OWA.

On pressing 'Send/Receive' evolution pops the error,
Error while performing operation.
Exchange transport can only be used with Exchange mail source.
How could I back out these evolution updates?

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Mar 8, 2009

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Feb 4, 2010

I have a mail server (dovecot+postfix) on Centos with amavis/clamav installed and working. It correctly identifies spam as such and puts it in the headers. I want it to move those suspected spam messages into a spam folder. I do have this working on an older debian server that I didn't setup. If someone could point me in the direction if where that config might be. I can't find it in any of the mail config files.Could there be a seperate package doing this?

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Jan 15, 2011

I've been pulling my hair out and can't figure out what's wrong. I have dhcp, squid, and dansguardian all running on my server, but when I point a client to it for a proxy (192.168.1.15:8080) and try to get to a website, nothing happens and the connection times out. When I don't bother with the proxy, the client has no trouble getting to the internet. I've verified I can ping the server and gateway from both machines. And the services are running, no errors noted in the logs. Do I need to do any iptables or selinux changes?

My network is very basic, several clients on the same network as the server, connected to a verizon gateway. Local addresses are 192.168.1.x. The server is 192.168.1.15, gateway is 192.168.1.1.

I'm using:

* squid-7:3.1.8-1.fc12 (x86_64)
* dansguardian-2.10.1.1-3.fc12.x86_64
* Fedora 12

My squid config file:

Quote:

#
# Recommended minimum configuration:
#
acl manager proto cache_object
acl localhost src 127.0.0.1/32 ::1

[code]....

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May 11, 2010

I have 4 servers running squid/3.1.1 proxy server. Since the latest version I can no longer FTP. I have posted this problem in multiple places but have received almost no response. I've found several other post to this problem throughout the Internet which have also gone unanswered. So, once again, I thought I'd give it a try. As I said "I have 4 servers running the newest version of Squid". When I try to access an ftp, any ftp, I receive an error (check attached image). This was never a problem until just recently. Squid should work perfectly find with ftp, it is not a strictly http proxy.

I turned my firewall off just to make sure, still had the same issue. If I jump directly on the server itself with no proxy settings set in the browser it will work fine. As soon as I set the browser setting to access the Squid software I get the same error. I've included my squid config (which is unchanged from the default settings), maybe somebody better versed than myself can point out an obvious flaw. Everything else seem to work just fine, it's only FTP that's a problem.

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May 13, 2011

I want to configure squid server with SSL so that users send clear text username/password and also data in encrypted mode. i googled but all of the configuration is for reverse proxy not requests from users to proxy server in LAN for example.

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Dec 19, 2009

I'm setting up email gateway using Postfix, Amavisd-new, ClamAV and SpamAssassin on Opensuse 11.1. Everything seems okie, but I can't have messages with added spam headers, such as:

X-Spam-Flag: NO
X-Spam-Score: 0.233
X-Spam-Level:
X-Spam-Status: No, score=0.233 tagged_above=-10 required=6.6
tests=[ALL_TRUSTED=-1.8, AWL=0.536, BAYES_50=0.001,]

When I try to debug amavis, I can see that SPAM-TAG, <abc@yahoo.com> -> <celeron@domain.com>, No, score=5.406 tagged_above=-999 required=6.2 tests=[LOCAL_DRUG=4, NO_DNS_FOR_FROM=1.407, NO_RELAYS=-0.001] but they don't add to email messages. I've configured amavisd-new with $sa_tag_level_deflt = -999 to add spam headers at all but not successful.

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Jun 2, 2010

I need to implement a form of filtering. Current topology is like so:

Internet -> Smoothwall -> MS Exchange server (w/ OWA) -> Clients

So I need to enable transparent spam filtering on the smoothwall system, which is a full fledged Linux system. There are no 'free' modules available for smoothwall that enable spam filtering. And due to the monetary constraints of the project I'm working on, something free is required.

I don't have any experience with this - I've done a couple of searches and came up with "SpamAssasin", but I can't find any relevant guides that allow transparent scanning - they all assume the mail is stored on THAT server.

So I'm here to ask the more experienced people what sort of packages will enable this functionality? Would like something that has a WebUI, but that's not absolutely necessary.

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Jun 21, 2011

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Oct 7, 2010

My client has finally had enough of being attacked via SPAM/Viruses and having his single email account for his company being destroyed. Since it is a single account and he does not want to add additional accounts or create a new one(mail is hosted by ISP), I wanted to ask the forum on their opinion on using Fetchmail to download the POP3 mail and having it piped through SMAM Assassion or DSpam and or CLAM_AV or F-PROT. In addition to that I am going to use a corporate strength anti-virus such as F-prot(Been using for years) and really put this email through a microscope. I also was thinking of just blocking out all domains other than his clients list of domains so in other words block all and allow just the domains that we know are valid and are only from his clients. It is super restrictive but what I believe will end his issue.

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Mar 4, 2011

I am using squid on my fedora box as a proxy server.By default the iptables (Firewall) service is on.To allow web pages to my client machines i stop the iptable service.

#service iptables stop

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Feb 7, 2011

There is squid 3.1.8 on a Fedora 12 server with 2 GB of RAM. It is used for sharing the Internet for approximatively 80 PC's. The problem is that it is really a memory hog, when enabling delay pools. I am using the following configuration for the memory pools:

Code:

delay_pools 1
delay_class 1 2
delay_access 1 allow drumuri

[code]....

There are moments when the squid process uses approximatively all the RAM and goes into swapping. After that I restart it, it goes well for a while and again eats up all the memory. On the Internet it says that Squid uses a lot of memory, but should it use 2 GB of memory, even if all 80 people are online at the same time?

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Aug 19, 2010

I have postfix installed for a while now. It seems as though my server is sending out spam to other people which is really bad...I got emails like this one:

Code:
Delivered-To: email@provider.com
Received: by 10.223.107.17 with SMTP id z17cs2705fao;

[code]...

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Jun 21, 2011

I have set up a couple of postfix servers for my domains, but the only thing I am missing now is this: How to block the public sending mail from my email to my email? I have managed it with SPF, but surely there must be a better way, that returns "relay not allowed" to the client. The SPF method costs too much, since it must make a dns request for each mail. So far, I have not gotten many of these mails, unless when testing my mailserver, but as I see it, anyone should not be allowed to send mail from abuse@mydomain.com to abuse@mydomain.com.

Somebody must have thought about this a long time ago, and there is simply that little line in main.conf that I'm missing.. My setup is this (virtual): I have a primary mx, with postfix, courier IMAP/POP3 server, a user database, and sasl via saslauthd. I also have a secondary mail server (backup mx) with no sasl auth, but with a copy of the mail users in the virtual tables, but added as relay_* users instead.

Spamassassin and SPF testing is replicated too, so most of the stuff should work, but I simply cannot find a setting in Postfix that denies someone to mail FROM my address TO my address. When mailing from my address and out in the open, they are required to authenticate, but not when using one of my my domain addresses, and also targeting my domain addresses.

As said, It is possible with a strict SPF setting, but that is at a cost for every lookup. It would be quicker for postfix to lookup the sender and the recipient in the relay/virtual tables, and deny if both addresses were in the recipient tables, and sender is not authenticated.

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