Debian Configuration :: Anti-spam Proxy For Mail On Server?
Jun 20, 2010
I was wondering if there was some kind of anti-spam proxy available for debian, that could serve as a layer between my ISP's mailserver and my email client. Something light, as it needs to be installed to a guruplug server with not much storage available. It would be great if I don't need to configure a fully fledged mail server but if it can function on it's own, only filtering spam messages. I already found assp and qpsmtp, but I find these very difficult to setup and assp is like huge.
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.
I will be relocating to a permanent residence sometime in the next year or two. I've recently begun thinking about the best way to implement a home-based network. It occurred to me that the most elegant solution might be the use of VM technology to eliminate as much hardware and wiring as possible.My thinking is this: Install a multi-core system and configure it to run several VMs, one each for a firewall, a caching proxy server, a mail server, a web server. Additionally, I would like to run 2-4 VMs as remote (RDP)workstations, using diskless workstations to boot the VMs over powerline ethernet.The latest powerline technology (available later this year) will allow multiple devices on a residential circuit operating at near gigabit speed, just like legacy wired networks.
In theory, the above would allow me to consolidate everything but the disklessworkstations on a single server and eliminate all wired (and wireless) connections except the broadband connection to the Internet and the cabling to the nearest power outlets. It appears technically possible, but I'm not sure about the various virtual connections among VMs. In theory, each VM should be able to communicate with the other as if it was on the same network via the server data bus, but what about setting up firewall zones? Any internal I/O bandwidth bottlenecks? Any other potential "gotchas", caveats, issues? (Other than the obvious requirement of having enough CPU and RAM).Any thoughts or observations welcome, especially if they are from real world experience in a VM environment. BTW--in case you're wondering why I'm posting here, it's because I run Debian on all my workstations/servers (running VirtualBox as a VM for Windows XP on one workstation).
My postfix server has been working great for the last 1-2 years. Lately the number of spams encreased (from 1-2 every day to aprox 8-10 every day per domain for some domains ).I post here the output of postconf -n. Maybe someone gives me some advices about what cat I change or how can I optimize. I must recognise that I don't fully understand details of how postfix and all the restrictions works together, but I will document every advice.
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>,
I am new comer in this forum and the beginner on freeBsdI have a problem on how to implement the spam filter program on mail server, the problem is i have no idea on how to implement and test the spam filter program on the mail server and where should i put the program? is it in pop3?
I'm new here and I'm sure this question has been thrown around a lot but I just couldn't find a solution. I have a networking website I've setup and we need to send notification mails to our members depending on activity related to their profiles(messages, comments etc).We are hosting the site on Centos5.6 with VirtualMin and are using Postfix as our MTA. We also use google apps for email on the site. Heres the problem, the mails go through for some gmail users but more often than not, they end up in gmail,hotmail and yahoo spam.We've setup the appropriate SPF codes on the server, DKIM and rDNS works fine.v=spf1 ip4:xx.xx.xx.xx a mx include:_spf.google.com ~all Below is a sample email that goes directly into gmail spam. I've replaced the actual values with dummy text (Ip, Domain etc)
Delivered-To: my.email@gmail.com Received: by 10.143.165.5 with SMTP id s5cs223598wfo; Fri, 15 Apr 2011 08:38:22 -0700 (PDT)
I need help with header_check filter on postfix. In the last week mail users received a spam e-mail without subject line and I don't know what is the way to reject this. This is the example of message header:
From: "example@example.com" Date: September 16, 2010 9:07:43 AM GMT-04:00 To: <example@example.com>
I want to reject e-mails that don't have Subject line
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 ?
I would like to run a mailing daemon on my system that would receive incoming mail and forwards it to my Gmail account. I have no experience in mail services and forwarding mail at all. where to start reading and/or look for clues?
i need to install a mail server with the following requirements: smtp, imap, web administration interface (users management to be done by a non-specialist) and ... to be easy enough to install/implement on debian (this is one time deal for me ...)
i used until now Xmail, phpxmail and nocc, very easy to install and it was working flawlessly, but unfortunately nocc is a too poor webmail client be cause is based only on pop3 literally the requirement is that on the web[client] mails sent must be saved and from what i see on webmail that only can be done with imap and (this is the big problem) Xmail does not support imap so i cannot install a good webmail client
I have been having problems with a lot of my emails being marked as spam or flat out being rejected. After doing some research, it looks like they are being denied due to my HELO and EHLO replies. Here is an example of my header file:
I would like to discuss setting up a mail server and its implications and alternatives. First, let us see if I have understood this correctly: A mail server consists of many different components. First, a server to listen to any mail inbound for a specific domain (say postfix), and then a POP3/IMAP server (say dovecot). Then, I should somehow configure the rules by which all mail is forwarded to their respective owners. This should be fairly simple by using debians package managers and dselect or whatever program it is that sets up right packages by use cases at the install.
But now lets assume a more complicated environment, where there are multiple users with different domains and needs. First, we need to send mail to ourselves from webapps for instance for backup purposes. So let's say we have a domain called domain.com setup, and we want to send mail to backup@domain.com. Unfortunately, some configuration issue makes the application get confused, because it is trying to send mail to itself, but doesn't quite understand what it should do. How can this problem can be solved?
Second, how could I configure different domains with different rules. For instance, if I want one domain to have a catch-all account, where random email sent to erroneous accounts is captured? Or if I want to create accounts which are not based on actual Debian accounts, but instead just random usernames (say, danny@domain.com, mike@domain.com, support@domain.com etc.)?
Finally, which are the best web-guis for doing such configuration? What if the customer wants to himself add accounts? I cannot require him to edit text files - especially if he can thus break the whole configuration for other customers as well.. postfix-admin is one, but it is quite crude-looking. Is there something which integrates both postfix, apache and dovecot configuration? How about Webmin?
Could anyone point me to some simple articles that explain what email encryption is and how to set up a mail server (e.g. Exim) that can send secure emails? I know nothing about networks, mail servers, encryption, etc., but I have to be an expert on it before I walk into work tomorrow morning.
There is an requirement, intranet people they may not have internet access but they want to send mail to external domain(internet),but in that intranet network one machine can have internet access. Is there any solution for this requirement.
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
I cannot get exim4 to actually deliver any "local delivery only; not on a network".But whatever I do in the config, all mail gets frozen with entries in the log file like:"root@empty R=nonlocal: Mailing to remote domains not supported"Maybe the problem is that there is no fqdn for the computer (and will never be). How can I enable local mail delivery?
I currently have the following email server set up:
Postfix with mysql backend 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.
how to defend from spam mail, actually i used centos. i want to absolutely block spam, my Mailscanner running ok but the spam still run off to my server. i do everything from tuning mailscnnner, spamassassin, amaisd-new but spam still send to user 10-20 per days.
I had setup postfix and spam assassin, and in my environment, I forward the incoming email to my exchange server.
Everything works now, in my mail box, I can receive the email with subject ******SPAM*****. but is there a solution, when spam assassin finished the scan and mark spam, if the score is very high, may be stop to forward it to exchange, for example, send it to a special email box?
I've got a web server that's hosting a few sites, and there are a few WordPress instances with these sites. With Wordpress, whenever a user registers with the site, they receive an email.With my server, it sends mail via Sendmail. This is all fine and good, except no matter what, it's flagged as spam. Is there any way to correct this?Keep in mind that this isn't a mail server, and the only reason the server ever sends mail is for new wordpress users and password resets.
Does anyone know if it is possible to set up Postfix to receive all email coming to mydomain.com and forward them to 2 different spam filters? All mail needs to go to both spam filters then onto our Exchange server
As a completely new user of Ubuntu 9.10 Karmic Koala, I will no doubt be asking some pretty basic questions, first. in Evolution Mail I am unable to get in or out it merely shows waiting, as Firefox is workingI am connected to the net (hard-wired to broadband wireless router), suspect I put dud info. in the initial set-up, but cannot find how to edit or re-enter these parameters.
Secondly on looking for AVG anti-virus progs on the internet, I find that there are several prefixes which one is for this version?
I have an issue with postfix and my server.One account (mine) is not considered as spam by no one. But all the other users are treated as spam by yahoo, and hotmail. And I can't understand why.Here are the header from one user who sent an email to my yahoo account (treated as spam):
Code: From userNAme Sat May 22 01:52:27 2010 X-Apparently-To: me@yahoo.ca via 98.136.183.25; Fri, 21 May 2010 14:52:55 -0700
i basically had this system installed for our mail system.The setup is as follows:
1. Operating system installed is Debian ver. 5.0.3
2. Roundcube is installed as a webmail(if its right for me to say that)
3. The server is hosted right here at our offices
4.The server uses relay system to send mail i.e. relays all our mails to our ISP
That all i can say about the configurations becuase thats as much as i understand it.The problem now is that we are not able to send or recieve emails from both internal and external.I tried to send mail to a collegue in the office who is on our local LAN,Roundcube says sent successfully but the person does not recieve the mail.i tried to send to my yahoo address but nothing.I dont know where these mails have been trapped.
