Server :: How To Block Domains (Postfix)
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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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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Jan 30, 2010
I have a postfix mail server up and running. I've added more than one domains to recive mail by adding them to the :/etc/postfix/virtual and poiting to a UNIX user account. That works fine. But when users send out mails (From squirrelmail) all users send from the same domain. How do I add a $myorgin to a virtual domain?
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Jun 7, 2010
I am setting up a Postfix MTA that will be only sending mail for 10 different domains. We have other servers that will be receiving the mail for the domains so I only need to set up for sending on Postfix.
What my issue is I am trying to configure Postfix so that when it sends mail the header shows what domain the mail came from and not the domain the Postfix server is set to. For example....
[URL]
When I send mail from domain2.com I want it to show in the header it was sent from domain2.com and not from domain1.com. What do I need to set in postfix so that this happens? Right now no matter what domain the mail is from the header always shows the server domain and I can't have that.
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Nov 15, 2010
I have configured postfix to send/receive mail from/to for two domains we manage. [URL] and [URL] Most of the cases there is no issue sending out or receiving emails. However, a few users of domainY.com complained that their senders were not able to sent them email. after much investigation, we started thinking that the mailserver failed to send us email may the failing on doing a SMTP Banner issue.
Is there anyone who knows how to deal with this SMTP banner issue with multiple domain. We want different SMTP banner when doing EHLO on different server.
530 mail.domainX.com ESMTP MailEnable Service, Version: 1.981-- denied access at 11/16/10 10:51:21
530 mail.domainY.com ESMTP MailEnable Service, Version: 1.981-- denied access at 11/16/10 10:51:21
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May 23, 2009
i have configured postfix to deliver mail from an internal mail server to external domains... however i keep getting this errors
Code:
un 10 23:23:59 smtpserver postfix/local[28831]: 7800CF0058: to=<root@smtpserver.domain>, orig_to=<postmaster>, relay=local, delay=0, status=sent (delivered to mailbox)
Jun 10 23:23:59 smtpserver postfix/qmgr[5989]: 7800CF0058: removed
Jun 10 23:25:19 smtpserver postfix/smtpd[28824]: connect from unknown[192.168.5.22]
[code]....
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Jul 20, 2009
I'm running a server with two sites which both need to be able to send emails. Currently I have Postfix set up to send email via Google Apps. This works fine, but Google's servers ignore the From: address I specify and substitute the one I logged in with. Is there a way to make Postfix log into Google Apps with a different username based on what site the email is coming from? The server does not recieve any mail itself; Google recieves it and we have it set to forward it to the appropriate person's real email address. I'm only worried about sending mail.
(Postfix is not a requirement here, so if there's another mailer that can do this better, I'm open to ideas. However, sending email directly from the server isn't an option as it's a residential IP address and blocked by most of the big email providers.)
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Jun 2, 2010
I am currently running a apache/postfix email service on my server. I am using aliases for two addresses for example:
trscookie@serverone.com
trscookie@secondserver.com
so the emails no matter which domain receives the email trscookie always will receive the email.
However I am unable to work out how to 'reverse' this process, for example.
If i was to go to secondserver.com/webmail I would like the emails to get sent from trscookie@secondserver.com however they are currently all coming from serverone.com. Is it possible to configure this so that it is sent from the correct domain?
Here is my main.cf:
queue_directory = /var/spool/postfix
command_directory = /usr/sbin
daemon_directory = /usr/libexec/postfix
mail_owner = postfix
[Code].....
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May 4, 2010
I've got a request from one of my company's subsidiaries to block all incoming and outgoing mail for a group of users. I've read up some guides on access.db and I know how to do that, but now they want to allow these users to receive emails from a few select domains, and block the rest. To summarize:
1) Block all incoming and outgoing email to users in team A, except mail from [URL]
2) All other users can receive and send mail from/to any domain.
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Oct 6, 2009
I would like to setup postfix to act as a relay for the outgoing mails of a couple of servers each serving it's own domain.The mails we are talking about are standard administrative emails like user registration, password reset request. The volume of those mails will naturally grow as the site grows. Which for me poses the problem that depending on the growth of the site you will sooner or later hit the quotas imposed by (my otherwise preferred) providers like GMail or smtp.com.
So what I need is a mail relay that will only accept mails from authenticated clients from hosts in its access list and relay their mail without restrictions. Is that possible with postfix? What has to be changed in the config and what are the pitfalls?
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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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Aug 6, 2010
Two exchange servers internally. One is setup for example.com (192.168.1.10) and the other is setup for example2.com (192.168.1.20) Both are behind a single public IP.
I want to use postfix to sit in front of the two exchange servers. Postfix will accept mail for both domains and relay to the appropriate server. I have postfix installed with only defaults at this point.
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Aug 4, 2010
I have Postfix + Unix Accounts + Virtual Domains. I have a bunch of domains hosted on my machine, let's call them [URL] [URL] and [URL]... etc Until know, domain2.com, domain3.com were mapped in virtual domains to [URL] So this is how /etc/postfix/virtual looks like:
[URL]
Like I said, all mail accounts are unix accounts, so, if for example I have the user "paul" this user will receive e-mail for ALL DOMAINS. [URL]But as it turns out, I now need a COMPLETELY ISOLATED domain... let's call it [URL]. So If I create a new user, let's call it "steve" I want steve to receive e-mail ONLY on [URL] and not on all others.
I would have to redo the whole thing from the beginning. I'd have to comment out the $mydestination parameter in the main.cf file and start using only virtual domains. So if I have the following users: paul, steve, sally, megan, jenny and I want paul and steve to ONLY receive mail for domain1.com, sally and megan to receive mail for domain2.com and jenny to receive mail for domainX.com, my /etc/postfix/virtual file would have to look like this:
[URL]
I'd have to create the unix account and then start modifying the /etc/postfix/virtual file.
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Nov 17, 2008
I would like to set my postfix to reject any numeric domains. I am seeing in my mail queue mail from domains like 2212.com, 263.com, 29.com and others. Because there is a variety of these, I don't want to track each of them and block them one by one. What do I need to put in my access file to reject any numeric domain? Is it possible to have a numeric wild-card reject in the access db?
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Aug 18, 2010
I want to change all outgoing email from my Ubuntu server running postfix to change (masquerade) the username. eg. james@example.com will appear as 'From' 'admin@example.com'. I already know how to masquerade domains, but not users.
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Nov 23, 2009
I've sifted through hundreds of Google results, but I cannot seem to find a tutorial or how-to for installing and configuring Postfix on Red Hat Enterprise for use with multiple domains. We have a web server serving four websites so far. Each of these websites has their own domain that they'll require email for.
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Jan 16, 2010
I'm having a problem with a new install of postfix... it won't relay mail to external domains. Internal mail is fine.I'm using virtual_mailbox_domains so that I can have multiple domains, and I've set dovecot to use local files with encrypted passwords.Here's my main.cf
Code:
alias_database = hash:/etc/aliases
alias_maps = hash:/etc/aliases
[code]....
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Apr 16, 2010
setting up DKIM AND POSTFIX FOR UBUNTU 9.10 WITH VIRUAL DOMAINS
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Nov 5, 2010
Let me start off by saying I am experienced with computers, though my knowledge of Linux and networking is limited. I've just recently started setting up a Ubuntu 10.04 server to be a SMTP server. I've followed this guide by the letter: [URL] What I've attempted, to test the server, is the following:
telnet localhost 25
ehlo localhost
(this returns all the desired information) I then do a MAIL FROM my domain which is accepted, and try to do a RCPT TO an external mail server (gmail) to test sending an email. I am then told 'Relay Access Denied'. I'm sure that there's something fundamental that I'm either not understanding or not doing correctly. I simply want an SMTP server that can send to other domains. What do I need to do?
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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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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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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
[Code]...
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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Sep 25, 2010
is there any HOWTO for configuring Webmin Postfix server with multiple postfix virtual hosts? Seems to be a tough challenge to set it up without any easy manual..
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Oct 4, 2010
so i set out to change the default smtp port the server uses because my ISP blocks port 25 and i need the email to work in outlook. this morning i could receive email, but not send it. so i did some research and thought that i needed to edit the master.cf file in /etc/postfix/ by commenting out this line: smtp inet n - n - - smtpd -oand replace it with587 inet n - n - - smtpd (587 being the port i want to use)somewhere along the lines postfix server stopped running and now i cannot get it to start.if i try using SSH it crashes immediately and if i restart it in simple control panel nothing happens
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Feb 25, 2011
I recently moved over user from an old box running postfix(v 2.0.16) over to rhel 6 running postfix (v mail_version = 2.6.6). ive tried to make sure all the files are of correct permissions and that the main.cf file is configured corectly. However there is something wrong as when i run postfix: service postfix server i get no error but when checking the status:service postfix status i get: master dead but pid file exists Looking into /var/log/mailog i find this line being the issue:
Feb 25 16:24:39 puny1 postfix/master[3517]: fatal: fifo_listen: create fifo public/pickup: Permission denied
I gather this is a file permission issue and ive tried to make sure the public folder in /var/spool/postfix is correctly set but still no avail.
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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"
[Code]...
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:
[Code]....
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Mar 12, 2010
I've tried to set up an old laptop with Ubuntu server - need to use it as a web server for a group of students on a local network only. I managed to get it working fine for just one user publishing webpages etc to a folder called VAR/WWW I could FTP files into the folder and access them again via FTP or a browser. I then decided to create some subaccounts (one for each student) I did this by typnig the following commands:
Sudo usermod -g www-data student1
Sudo chown -R www-data:www-data /var/www/student1
Sudo chmod -R 775 /var/www/student1
(In this example student1 is intended to be a subfolder of www and act like a sub-domain with write authority- at least that was my intention) Problem I then get is that if I use Filezilla to access each account I cannot see where to publish the files - wherevever I place them they are not accessible from the browser. Do any of you experts out there know the answer to my problems please.
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Apr 28, 2010
I am looking for a code for setting virtual alias for all domains and addresses. The scenario is that when I send an email from anywhere to my server, it will send to only one address but not send to the orginal recipient.
This is my code: I think the problem may be from the regular expression (.*) for any domains/email addresses
/etc/postfix/main.cf:
virtual_alias_domains = (.*) <-----
virtual_alias_maps = hash:/etc/postfix/virtual
/etc/postfix/virtual
(.*) admin@myserver.com <----
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Mar 18, 2010
how would i move from domain1.com to domain2.com whilst making it so people can still use the old domain if they wanted to?
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Jul 20, 2010
I am still in Linux Diapers. I setup a CENTOS SELINUX box on an internal network. So the only way I know to access it's served pages is by navigating to 10.1.1.40 from a computer within the network. The issue is that I need to create sub-domains for this server but have no Idea how to go about doing that.
Is there a way of creating an alias for the dev server so I can type something like "washington" into the web browser of a computer on the internal network instead of 10.1.1.40? Can I use a fake FQDN that on this server and get served its web pages or do I need to register a FQDN?
Background: I am creating a series of websites using Drupal and am trying to implement the multisites functionality (all the sites are run from a single code base). To do this they suggest setting up each site on a sub-domain during development. We have not yet purchase the FQDN's for the sites so I have no FQDN to setup.
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