Ubuntu Servers :: Block Spam In Postfix Based On Keywords?
Jun 23, 2011
i keep receiving this damn annoying spam: Quote: No Cost Website Analysis and Ranking Report Rank mysite.com at the top of the 3 major search engines Do you want to know why your competitors are showing up at the top of the three major search engines and how you can rank on top? To increase the number of visitors to your website it is crucial that you have a top search engine position. If you are like most people, you will spend countless hours trying to get traffic to your website.
Our search engine optimization experts will run a detailed website ranking and analysis report showing you exactly where mysite.com currently stands in all the major search engines along with the recommendations of how we can increase your ranking on Google, Yahoo and Bing. For Your No Cost Analysis Report and More Info Please Click Here
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i get about 30 of those a day, everyday, for a long time. ive asked the ISP to stop it (theplanet.com) they are not responding and the spam continues. i was thinking is there a way that i can tell postfix to reject emails that contain "No Cost Website Analysis and Ranking Report" in their subject? there must be a way but i dont know how.
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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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May 17, 2011
Very new to Ubuntu and Linux so this may be a simple one. I've recently setup an Ubuntu Server 10.04 box as a mail relay running Postfix and Amavisd-new (Spamassassin & ClamAV) and this has been working really well. I started to get a few emails through today with the following header[URL]..(removed domain name) The name's always in quotes and random. The fqdn is that which I configured in postfix as $myhostname. I can't figure out how this address is being used. This box is only used for incoming mail and acts as a relay to Exchange. Exchange doesn't send out through it. The only thing that may be going outwards is bounced messages from Exchange which are almost exclusively to linkedin.
The fqdn isn't public. This box isn't even part of our internal domain, it's just named that way with manual DNS added. Anyone seen this before? Will this header have been part of the message when it arrives at postfix or could this have been added by postfix itself?
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May 21, 2010
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
[code]...
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Feb 3, 2010
Does anyone know how to block spam in the messenger Empathy? In my case it got to a level where I consider it as very annoying.
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Jun 21, 2011
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.
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Mar 11, 2010
Here is what i do: make clean make makefiles CCARGS='-DEF_CONFIG_DIR="/opt/product/postfix-2.6.5/etc"
-DEF_COMMAND_DIR="/opt/product/postfix-2.6.5"
-DEF_DAEMON_DIR="/opt/product/postfix-2.6.5/libexec"
-DEF_MAILQ_PATH="/opt/product/postfix-2.6.5/bin/mailq"
-DEF_DATA_DIR="/opt/product/postfix-2.6.5/lib"
-DEF_NEWALIAS_DIR="/opt/product/postfix-2.6.5/bin/newaliases"
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make install then i got this error: postfix: fatal: chdir(/usr/libexec/postfix): No such file or directory make: *** [install] Error 1 I don't understand why it's checking the usr/libexec folder for the daemons although I've set the folder to /opt/product/postfix-2.6.5/libexec in the makefile. Here is also the cat of my makedefs.out:
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Apr 21, 2011
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
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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;
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Apr 16, 2011
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)
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May 8, 2009
It's possible to configure Postfix in order to check spam only for outgoing email?
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Feb 26, 2010
I followed this How To (https://help.ubuntu.com/community/Postfix) in order to add smtp authentication to my Postfix installation used as spam filter for my exhange server, and it'seem all ok; the only thing that I don't understand is where I list all the users (with passwords) that I authorize to send mail through my 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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Nov 20, 2008
who manage Postfix servers, what do you recommend is the best way to refuse all incoming and outgoing mail to specific domains? I want a blacklist of domains such as:
- AOL
- Yahoo
- MSN
- Hotmail
- Gmail
Is there a proper way I can tell Postfix to please deny sending and receiving SMTP traffic to and from those specific domains I specify? I see no need in my corp. mail server has to communicate in any way to those. I allow access to all those accounts via port 80/443 so they can just login to the web and send non business related junk this way.
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Aug 11, 2011
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?
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Jun 18, 2009
I am running a spam filter on debian lenny 5.1 with postfix, amavis-new, spamassassin, and clamav. It works pretty well but I would like to finish tweaking it to minimize the mail getting quarantined. It really isn't quarantining anything that isn't spam, except for an occasional list mailer. However, the quarantine is huge, and takes a while to go through. I noticed that much of the spam is coming from foreign country tld's like .cz is there anyway to have postfix run a check on the header and if the email, or smtp origination is from a server from a foreign tld have it just rejected. I can whitelist anything if need be in the future but as of now we don't do any business overseas and don't need to worry about blocking legit email.
I think this should be possible, however, I am unsure of the syntax for the file, where to put it and if wildcards are possible in domain blocking like
Code:
*.cz REJECT
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Mar 2, 2010
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.
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Jun 16, 2011
I implemented postfix as mail gateway but i need to block the ability to send
mails via telnet
How can i achive this?
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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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May 2, 2011
I have a system running at home that uses Getmail to retrieve mail from my ISP's pop server. Dovecot then offers that mail over IMAPs to my desktops running Thunderbird.
The reason I have resorted to using Getmail is because I don't have a static IP (from my ISP) for my server, and thus this server doesn't act as an MX.
I have implemented Spamassassin in my Getmail script as described here.
From further research, I understand that in order to fully utilize Spamassassin 's potential, I have to resort to training it with SA learn.
Currently I still receive spam messages, but 50% of spam is marked as ****SPAM****, and the other half is not marked at all.
My question is this:
1) How do I get getmail to move messages marked as spam by spamassasin to be moved to a JUNK folder within my mailbox automatically?
2) I thought of creating a folder where my users can move messages they deem to be spam, and set up a crontab script to invoke salearn regularly on this folder to get the bayes engine to learn from it. Is this the correct way of doing it?
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Oct 25, 2010
I'm looking for a write one, read many file synchronization, file system or similar technique. In fact I want a to imitate a zfs_send/zfs_receive similar behaviour on Linux. My requirements are pure local (or in terms of distributed file systems: rack-aware) file handling with remote synchronization. Some random features/requirements I want to achieve are (I use the terms file and "file system" here interchangeable, as I don't care wheter I have to synchronize file based or use full file system supporting that):
Access on files from a specific host is pure local, i.e. the node has a full copy of a file, no parts are distributed. Read and write access is local, the remote side gets synchronized with write changes only Write changes on the remote side are non-blocking and asynchronous No need for concurrent file access, concurrent, distributed locking and so on Every file is changed by a single node only, other nodes have read access The file "owner", thus the node allowed to write files must be changeable Similar techniques (some as technology concept, not usable for me) exist, among those DRBD, MySQL Replication or even pure rsync.
I don't care whether I'm referring to a pure local solution (i.e. between two block devices) or a client/server mode. DRBD won't fit because its a peer to peer solution, I need to synchronize a lot of clients with a central storage through that way where DRBD just mirrors from peer to peer among two nodes and doesn't allow another node to take over the role of the primary node (i.e. node A is master, storage B secondary, I want to change to a thrid node C which becomes master and receives hence a full update from storage B.
Just as a guess, I'd make a local LVM volume on every node where write access happens. In the same time there exists a iSCSI target with multipath to a remote hosts which is shared with every node, again providing a clustered LVM. So I'd need to synchronize a local LVM volume with a remote LVM image. The question is just by which technique I could achieve that (i.e. as RAID 0, where every read and write goes to one node only and doesn't wait the other node to succeed). I could achieve this with rsync by a cyclic push to the remote host, but the problem is, that rsync isn't block based thus I'd need to synchronize every time the whole file, not only changes.
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Mar 22, 2016
The problem I have is so simple yet difficult for me to resolve. My Postfix MTA allow fake mails from me@example.com to me@example.com. How can I block them?
For example, if I do "telnet smtp.mail.yahoo.it 25", as I write the MAIL FROM command I get the alert "Authentication required". How can I achieve that?
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Jul 8, 2011
I'm looking for a way to redirect e-mail with postfix based on sender AND recipient. What I want: Let's say I have 3 users:
[code]....
and an external address, let`s call it [URL] sends e-mails every day to andy, mark and john Now, MARK and JOHN, need the e-mail sent by [URL], but TOM doesn't need it. Is there a way to redirect ONLY the e-mail sent to TOM from [URL], to some other address, let`s say [URL] without affecting the e-mail received by MARK and JOHN? Unfortunately using SENDER ACCESS redirects ALL e-mail from [URL]
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Oct 16, 2009
I'm running FC10, with the sendmail that was part of it in Feb 09. Anyway, Up till now I've been using the user client to do spam filtering, But I'd like to start catching the spam at the sendmail level. What are my options today? I tried searching the forums and found a bunch of threads from 2001-2006, but I figured many of the ideas are now longer vaild.
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Jul 5, 2011
how to unblock email with attachment .zip should be all attachment through to my email i have below message when people sent me email to my domain
Warning: This message has had one or more attachments removed
Warning: (the entire message).
Warning: Please read the "Apex-Attachment-Warning.txt" attachment(s) for more information.
This is a message from the MailScanner E-Mail Virus Protection Service The original e-mail message contained potentially dangerous content, which has been removed for your safety. The content is dangerous as it is often used to spread viruses or to gain personal or confidential information from you, such as passwords or credit card numbers.
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Aug 25, 2009
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.
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Mar 5, 2011
I have setup and apache server on my pogo plug pink. I would like to setup a a web based file manager. I Googled it and tried a few of the top few but none of the worked that well.
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Jul 10, 2010
I know you can use grep to find keywords in filenames, but is there a variation that can enable you to search the content of the files themselves?
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Feb 1, 2010
I have installed 9.10 server on an old machine at home that I want to use purely for managing any software downloads.
I used to use the firefox add on DownThemAll on my ubuntu desktop environment so I am looking for a web based download manager for the server that has similar features (username/password restricted downloads, scheduling, pausing/restarting downloads) as DownThemAll.
I basically want to be able to add a bunch of downloads to a list and the server then downloads them. I need to be able to save a username/password combination for certain sites. I would also like to be able to see progress on the downloads and pause/resume them
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Jan 3, 2010
I have a postfix server running on a virtual machine hosted by vpslink.com. I have followed the following configuration guide to install the system with dovecot, sasl smtpd authentication, and postfix as an mta: [URL](I know it says it's a debian configuration, but it seemed legitimate that I could follow it). Anyway, in sending email from my primary email account, I have found that roughly 1/2 of the messages are delivered, and 1/2 of them are rejected with a message similar to the following:
Quote:
[code].....
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