Ubuntu Servers :: Postfix Per User Smtpd Restrictions?

Feb 15, 2010

Been trying for some time to get Postfix to not allow some internal users to send email externally. I have found some good resources online but none of them work. The user is still able to send email internally and externally.

I used the following web pages to assist me... [URL]

Below is my main.cf
# See /usr/share/postfix/main.cf.dist for a commented, more complete version
# Debian specific: Specifying a file name will cause the first
# line of that file to be used as the name. The Debian default
# is /etc/mailname.


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Server :: Postfix Per User Smtpd Restrictions?

Feb 16, 2010

I have searched other post on here and they appear to be relevant but when I enter in the exact same commands it denies relay access to everyone. I have also used the postmap command to refresh the database.

Feb 16 15:54:48 EMAIL2 postfix/smtpd[6512]: NOQUEUE: reject: RCPT from localhost[]: 554 5.7.1 <josh.dobs@gmail.com>: Recipient address rejected: Relay access denied; from=<msolis@EMAIL2.drewmedical.com> to=<josh.dobs@gmail.com> proto=ESMTP helo=<>

I used this page as reference. [URL]

Below is my main.cf
# See /usr/share/postfix/main.cf.dist for a commented, more complete version
# Debian specific: Specifying a file name will cause the first
# line of that file to be used as the name. The Debian default
# is /etc/mailname.


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Server :: Maps / Restrictions Clarification - Postfix

Nov 22, 2010

I seem to be able to install / configure Postfix server in 10 minutes as an MTA for a single domain but my struggle is really understanding the maps / restrictions which even after reading "The Book of Postfix" is not very clear to me:


My question is between those commonly used three maps above, what are the difference between them and how do I know when to use one over the other? Can someone clearly explain them to me? Here's what I have in my 'main.cf' but honestly I couldn't tell you if they're correct or now:


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Ubuntu Servers :: Postfix Make Install - Error - Postfix: Fatal: Chdir(/usr/libexec/postfix): No Such File Or Directory

Mar 11, 2010

Here is what i do: make clean make makefiles CCARGS='-DEF_CONFIG_DIR="/opt/product/postfix-2.6.5/etc"


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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Ubuntu Servers :: Install Postfix In Order To User Squirrelmail Or Roundcube?

Nov 20, 2010

I'm configuring a server but at this time I can't send mail. I tried using the PHP mail() function and it didn't work. Webmin says I have no mail configured. I'll be the only user and mail recipient. I've used Squirrelmail and Roundcube before and liked them.

Do I need to install Postfix in order to user Squirrelmail or Roundcube? How should I set up mail?

Here's my setup:

10.04 LTS Server edition
Webmin 1.520
Apache 2.x
MySQL 5.x
PHP 5.x

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Ubuntu Servers :: Postfix, When I Use Postfixadmin To Setup A New User, The Maildir Does Not Get Created ?

Jan 31, 2011

I configured my server to have the virtual mail authenticated and stored through mysql DB.Now the authentication works, but then I got the dreaded -ERR chdir error.After research and testing for ohurs I finally got it working on ONE account after I created the maildir with maildirmake.Now I am able to login and "list" messages, but nothing else. When I use postfixadmin to setup a new user, the maildir does not get created so I have the same problem.I'm trying to troubleshoot what is happening.Here are the relevant config files:


smtpd_banner = $myhostname ESMTP $mail_name (Ubuntu)
biff = no[code].....

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Ubuntu Servers :: User Creation In Postfix - Cannot Send Or Receive Email

May 3, 2011

I used this tutorial to setup to setup iSpconfig postfix courier: [URL] but i cannot send or receive email:


Basically when i create users in ISPconfig, something goes wrong, mysql is running and i have postfix-mysql installed and running too.


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Security :: User Bypassing Demo Restrictions?

Jan 17, 2010

I have a user that has already used up a demo 24hr trial on my website. At present, I only check the customer id and the IP address to search for duplicates. On the whole this works but it's not foolproof. We now have 1 user from China that is changing their IP address everyday to get access to the free trial. Any options on what to do? I thought of downloading a cookie to their computer that the website could pick up - again not foolproff but most people don't disable cookies. Any other options?

I could ban China temporarily until the user gives up but if they find another proxy to chain then their IP address will be different again.

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Ubuntu Servers :: Ssh Restrictions Per Interface ?

Aug 20, 2010

I have a server with two active network interfaces. On one, I need ssh open for all users (it's running LTSP, and as I learned the hard way today, blocking ssh kills LDM access).

On the other interface (which connects to the rest of the network), I only want to allow a few administrative users to connnect.

Is there a way to do this cleanly using sshd_config or PAM? I don't want to do something hacky like running dropbear.

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Ubuntu Servers :: Put A Few Login Restrictions In Place?

Jun 3, 2010

I've got Ubuntu server 10.04 set up and I wanted to make a few restrictions. It's pretty much just acting as a VMware server at the moment, and there are some users I've created who I only want to be able to be able to log into the VMware infrastructure web interface. I want to make sure these users can't log in via SSH, FTP, or the console itself. I understand how to block them from logging in via SSH by using DenyUsers, and I added these users to the /etc/ftpusers file to lock them out of FTP, but how can I block them from logging in at the console itself?

I tried locking the user out by editing the /etc/passwd file, but the problem is that by doing this, it also prevents the user from being able to log into the VMware web interface.

The user's entry in /etc/passwd looks like this: bsmith:*:1005:1005:Bob Smith,,,:/home/bsmith:/bin/bash

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Ubuntu Servers :: Set Sudo Commands Restrictions

Nov 7, 2010

does anyone know how to set restrictions on the commands a user can run as sudo? i want to make it so they can only halt the system.

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Security :: User Access Restrictions To Network, USB Ports, PCMCIA, CDROM

May 3, 2011

How to create a user account on a Linux desktop machine with restrictions on connecting to the LAN, WAN, PCMCIA ports, Firewire, CDROM and generally any user controllable output options?

I have the task to set up a machine for users working with sensitive data that should not be leaving the machine where it is processed. This means disabling access to the ethernet device, lan, all other ports as mentioned earlier, and any other way of leaking the data.

In Mac OSX this was achieved using "Parental controls" from the System preferences; this even allows a selection of the applications that can be used. Under XP, Device Manager offers the option to click various devices and "Disable" them, which worked so far just fine. Some will point out that the latter mentioned OS may be easy to circumvent the security of in other ways, but that has been mitigated with other measures and it's not the point anyway. For the operator users in question, the aforementioned measure proved successful and worked.Using OSX and XP to do this was a 10-15 minutes job with testing included.

So far all guides and tutorials pointed to useradd, groups an facl, but in actual practical terms did not help at all, in fact most of the research did not render any practical results so far. I surely don't expect to point and click, and would gladly run a set of commands from CLI. If I had them. I would really would like to achieve the same restricted user account configuration in a concise, comprehensive and practical manner under Linux too. Preferably tested on humans before, and known to be workign, of course.
The machines that need to be set up are two laptops running Ubuntu. So how can this be accomplished in Linux?

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Ubuntu :: Can't Find Smtpd.conf / What To Get That?

Jun 30, 2011

I can't find smtpd.conf as described here: https://help.ubuntu.com/community/Postfix
Do I create the file or do I have to do something to install saslauth?

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Server :: PostFix - ISPConfig Mail Return - Unknown User" Or "no Such User Here

Feb 9, 2010

I have set up a debian 5 server with ISPConfig and PostFix using Perfect Server toturial [url].

Now i have huge problem i'm getting eather "No such user here" message from SMTP server hosted at hosting provider or Unknow User: name from my ISP's SMTP server (free mails they provide)...

Mail LOG:


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Server :: Postfix Mailbox User Migration?

Jan 22, 2010

I'm looking into migrating postfix mailboxes and users from an old machine running Fedora5 to a new machine running cenOS. I was wondering, what would be the procedure to migrating over existing postfix mail to the new machine? Is it as simple as copying over /home directories and /etc/passwd etc?

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Server :: Mail Is Not Forwarding For Particular User From Postfix To Exchange

Sep 16, 2010

I have an issue in my organisation that a particular user X's mail not able to forward from my linux server MTA postfix to my second windows exchange (HUB)mail server. We use linux mail server as SMTP Gateway we have implemented fetchmail for doing this job. and its MTA is postfix OS is SUSE. Rest users mail are able to come in exchange HUB server via linux mail server. When I see that purticular user X mail in linux I am able see its spool file in /var/spool/mail and also via mail or mutt command. My question is why postix not able to forward that user X mail to our exchange HUB server.

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Server :: Postfix 2.8.2 Rejecting Some Mail With User Unknown?

Apr 22, 2011

I have this strange error - I switched from postfix 2.6.5 to 2.8.2 and I some mailservers cannot send mail to me. One of them was some sendmail server. I have virtual alias maps in mysql. It works fine for almost all server that are sending mail to me, but some of them seems to send mails as user@FQDN instead of user@virtualdomain my machine name is x49.tvujweb.cz, and mz email is kamil.horky@servis-it.net but in server logs is that user kamil.horky@x49.tvujweb.cz cannot be found in virtual alias maps.

here is my postconf:

2bounce_notice_recipient = postmaster
access_map_defer_code = 450
access_map_reject_code = 554
address_verify_cache_cleanup_interval = 12h


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Server :: User Mailbox Size In Postfix/Sendmail?

Apr 6, 2010

I'm running Postfix in slackware 12.1. The mails are stored in /var/spool/mail/username. When a user's mailbox size got more than 200MB, the user can't check their mail. when it happend the log shows:

Apr 4 10:04:11 ns1 popa3d[2391]: Authentication passed for userX
Apr 4 10:04:11 ns1 popa3d[2391]: Failed or refused to load /var/spool/mail/userX

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Software :: Create User Account Filter With Postfix?

Jun 21, 2010

I am using this config.

I'm looking to create a white-list of email addresses that are allowed to send mail to my son's email address. Basically, I'm trying to do this:

if from not in ('dad@home.net','mom@home.net','unclebill@work.org')
then deliver to 'dad@home.net'

Or deliver to /dev/null or something.

This would be only for his account/domain, not server-wide.

The configuration above uses MySQL for forwarding and authentication. I'm not sure if that is a plus or minus for what I'm trying to do.

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Software :: RHEL6 Sendmail & Postfix Can't Use Local User?

Jul 3, 2011

I've tried to configure the mail service in RHEL6 but seems both sendmail and postfix can't use local user located in /etc/passwd.

Like, user Tommy and Jake they got User Unknow from maillog
But IF I use users' home folder not located in /home then it can go throught.mailuser2:x:513:514::/rhome/mailuser/mailuser2:/bin/bash mailuser3:x:514:515::/rhome/mailuser/mailuser3:/bin/bash


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CentOS 5 Server :: Postfix Multiple Domains One User?

Jun 2, 2010

I am currently running a apache/postfix email service on my server. I am using aliases for two addresses for example:


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


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CentOS 5 Server :: Unknown User Error With Postfix?

Mar 22, 2011

why no matter what email I send to a user I get this error relay1 postfix/local[4023]: 75941291D4: to=<username@domainname.com>, relay=local, delay=0.14, delays=0.07/0.02/0/0.05, dsn=5.1.1, status=bounced (unknown user: "username")

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General :: Postfix Smarthost Not Relaying Mail To Exchange For One User

Sep 14, 2009

I have a RHEL 4.5 with Postfix 2.2.10 configured as a smart host for an Exchange 2003 server. Its been running well for three years like this. We have some users that are configured with alternate SMTP addresses for a secondary email domain in Exchange. One user is not getting his email for the secondary SMTP. All the others are. After some digging, the maillog indicates Postfix is not relaying his email to Exchange but to the Postfix local mail folder under /var/spool/mail. What in the configuration would cause this? His email is in the relay_recipients file as the others are.

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Software :: List All Postfix User Accounts In Command Line?

Mar 14, 2010

how to list all postfix user accounts in command line?

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Ubuntu Servers :: Postfix: How To Get The Configuration

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:



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Ubuntu Servers :: Can't Seem To Reinstall Postfix?

Jun 30, 2010

I can't seem to reinstall Postfix. I followed a guide and couldn't get it to work. After I retried a few times I gave up and deleted all files and folders I could find related to Postfix. Well I realized what the issue was and now that I want to try reinstalling Postfix it won't allow me.

When I type:

sudo apt-get install postfix
Reading package lists... Done
Building dependency tree
Reading state information... Done
postfix is already the newest version.
0 upgraded, 0 newly installed, 0 to remove and 3 not upgraded.
1 not fully installed or removed.


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Ubuntu Servers :: Can't Get Mail With Postfix On 10.10

Dec 18, 2010

I am trying to install a mail server (postfix). I followed the instructions (up until SMTP, I do not want that) on ubuntu pages, without any result. I can send mail, but I can't get any.

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Ubuntu Servers :: Cannot Install Postfix?

Jul 11, 2011

I have been following the guide atand it has all worked perfectly and as expected, except for when it says to run "telnet localhost 25". Instead of getting an ip address displayed as I have seen it is supposed to, it just out puts this."Trying to localhost.localdomain.Escape character is '^]'.Connection closed by foreign host."

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Ubuntu Servers :: User Quotas - Limit - One User Should Be Able To Use 1900 GB And The Other 600 GB

Oct 29, 2010

Im trying to limit the diskspace users on the system may consume, and i found quotas (im a total linux noob). But when i try to set it, no matter what i set it to the maximus is 2 GB. Now... i need quite a lot more than that. One user should be able to use 1900 GB and the other 600 GB. How can i fix this? Im using ubuntu server 10.04.

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Server :: Postfix: Customized Reject Message Per Virtual Domain (or User)?

Jul 30, 2010

I have a mail server taking care of mail for my 4 domains; the first is used for virtually all mail, the second rarely used anymore, the third is virtually 100% spam the past year(?), and the fourth isn't in use (and never has been, so no spam). What I'd like to do is to reject all mail to the third domain. Right now this is what I get (I tried to send to a nonexistent address from gmail):


Since my username (xyz@) is the same for all domains, I could (or so I hope) change the reject message to give a hint to replace [URL] with [URL] and try again.

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