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 '' but honestly I couldn't tell you if they're correct or now:


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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 <>: Recipient address rejected: Relay access denied; from=<> to=<> proto=ESMTP helo=<>

I used this page as reference. [URL]

Below is my
# See /usr/share/postfix/ 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 - Virtual Domain And Alias Maps Results In 'unknown User'

Aug 16, 2009

I've setup postfix using mysql tables and all works except for sending to an alias. The mysql logs show that postfix is only looking at the mailbox table for where to deliver the mail for the alias. However it is not looking in the virtual alias maps table. There are no complaints from postfix on startup to indicate that there is anything wrong, and if I send to a virtual domain listed as a relay on the server it does look up the virtual alias table... even though the domain is not hosted on the server....

So the question I have is where to look next? The mysql log shows the expected lookups from postfix EXCEPT for the virtual alias map queries.... why would it not be checking the table? Since it is not looking up the virtual alias it bounces the addresses back to sender complaining that the user doesn't exist... It does deliver to a virtal mailbox, however again it never checks the vitual alias table.... so it only delivers since there's a mailbox for it rather than needing an alias...

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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
# See /usr/share/postfix/ 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 :: Preventing SSH Timeouts - Some Clarification?

Jun 8, 2010

We are seeing some dropped SSH connections because of which some of the process are failing . The main likely reason for the connection drops is that both the client and server remains 100% busy during a certain time interval and during that time interval we see those occassional connection closed by the server.


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Debian Configuration :: Error Found With "Postfix Virtual Maps": No "map Sources"

Aug 17, 2010

error found with your "Postfix virtual maps": No "map sources" were found in the Postfix configuration. your system is not ready for use by Virtualmin. how do I set this?

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CentOS 5 Server :: Winbind UID GID Maps Are Not Correct From Two Diffeernt Servers

Apr 8, 2010

Centos 5.4 64bit fully updated. What I am doing is vsftpd is setup and nfs shares are mounted to a NAS server which is running openfiler 2.3 fully updated. openfiler is winbind to AD and pulling users and groups over.

I have it confirmed working when a ftp users connects the username/password is authenticated against AD which works. User can login and is directed to the users folder on the nfs share.

Openfiler shows me UID and GID numbers for users and groups, centos also shows me UID and GID but they are different which is causing permissions/quota's to not work right.

Both servers are setup with krb and winbind, openfiler has a more recent version of winbind.

Here is an example...

AD Users are

user UID of 160010 as an example
user1 UID 160011

When user logs into the vsftp server it works and chrooted into the directory for that user. When user uploads files I can upload but the UID in the ftp client shows 1600011 which is user1 UID

logging into windows to that share shows in the security tab that user1 uploaded the files.

Centos is mapping user as 160011
openfiler is mapping user as 160010
windows is showing the user1 in the security tab.

So it appears that centos is not mapping the right numbers to the right users and groups.

If you need details please ask for it and I will provide.

Both configs are nearly a match and I have made small changes to the config files smb.conf but it failed resolve these issues to work so I reverted back. kinit works with authentication, getent works, wbinfo -a and -u works. wbinfo -u user shows different results on both servers, but authentication works user/password and I tried a different password to test.

Is this a known bug or a silly misconfiguration? I had authentication GUI tool configure the winbind stuff so its all fairly standard on the centos machine and the openfiler gui configure winbind configs.

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CentOS 5 Server :: Ftp Server With Folder Access Restrictions

Dec 10, 2010

'm a bit familiar with Centos as I have set up few website on this environment but I have never actually installed, and especially, configure ftp server. Now I need to do this. Simply I need to be able to create an access account for a user and then restrict access to only one folder within the website (idea is to allow this user to upload images via ftp). I did google for ftp servers and read about vsftpd but I couldn't find any tutorial on how exactly make it work with folders and specific users.

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Software :: Free Smtp Server With No Restrictions?

Feb 16, 2011

I'm trying to configure notifying 'sys admins' cellulars about some events in clients IT infrastructure. In linux env it would be ease, just to use 'mail' cmd but need solution for windows env in this case.

I have RAID Controller running under windows xp and its raid array sotfware has feature to notify about events by email. I found some free solutions on the internet but most of them are shareware and if are freeware, they have limitations e.g. nr of sent emails per day.

Is there some free smtp server that I can use with no limitations?

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Ubuntu :: Configuring Webmin Postfix Server With Multiple Postfix Virtual Hosts?

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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CentOS 5 :: Postfix Mail Server Will Not Start Tried To Change Postfix Smtp Port?

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 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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Server :: Updated Postfix Not Running After Transferring Over Users From Older Postfix?

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 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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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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Security :: Clarification On SELinux Catorgories?

Jan 12, 2011

having trouble understanding selinux. the domain is cluster containing permissions. a type is nothing more than a label applied to something like a file,right? so instead of applying the permission set of foo domain to the /etc/shadow file it would be apply label shadow_t to /etc/shadow and make the shadow_t apart of the foo domain?

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Ubuntu Security :: Clarification On Firewall Rules?

May 9, 2010

I have a set of iptables rules generated by Firestarter, and i'm in the process of trying to familiarise myself with iptables itself, but there's one particular rule which is confusing me, perhaps somebody could explain it to me

My INPUT chain reads as follows:

Chain INPUT (policy DROP)
target prot opt source destination
ACCEPT tcp -- anywhere tcp flags:!FIN,SYN,RST,ACK/SYN
ACCEPT udp -- anywhere
ACCEPT tcp -- anywhere tcp flags:!FIN,SYN,RST,ACK/SYN


Given that the firewall is actually blocking packets, it can't be this simple, so what am I missing?

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Programming :: Clarification In The Select System Call?

Dec 8, 2010

I have a process that forks, where the childs puts some data of random size and exits while the parent should get the data and does some manipulation.. here I have used a pipe for child to write the data and parent to read the data.. Child simply dumps the data, and the data is of any size even child and parent doesnt know.
I have used select in the parent to see whether there is any data coming on the reading end of the pipe.. if there is a data.. I copy into a buffer.. Im reading the data continusly when the child exits after closing the writing end of pipe. Parent gets blocked on the read part But my question is how parent know the other of pipe is closed when using the select call. In otherwords.. while using select in readfds, how would i know the other end has closed the pipe..

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Fedora :: Software Installation Clarification Requested?

Mar 18, 2011

I searched this on the web to no avail. Could I get a clarification on what exactly Yum ,Yumex, and Packager Installer are? Yum is the terminal and Package installer is (System>Addministration>Add/Remove Sofware correct? Additionally what is Yup and what is Yumex.

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General :: Automounter Not Using NIS Maps?

Jan 3, 2011

Does anyone know how to get the autofs to use NIS maps to create mount points for NFS mounts? I see no reason to create a local /etc/auto.home just to add the line +auto.home. I am using CentOS 5.5.

What's really irking me is that I have 2 machines that work and others (freshly built) that don't and I haven't found the difference (yet)!

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Ubuntu :: Run Locally Maps Program?

Mar 5, 2010

I'm planning a trip and google maps/bing maps/mapquest seem to not like to have too many points on the itinerary. Is there a good similar program that I can run locally?

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Ubuntu :: USB Drive And Dev Entry Maps?

Oct 30, 2010

How do you find out which USB device in lsusb maps to what /dev entry? How do you find out which /dev entry maps to what /device entry? What about drives with multiple partitions?

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Server :: Move Mails On Exim Server To Postfix Server?

Jan 12, 2010

how can I best transfer my mails that are sitting on my old exim server to my new postfix server?

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Debian Multimedia :: Xastir / Testing - No Maps

Sep 19, 2015

I am running fully updated stretch/sid with xfce. Xastir is installed from the repos. Imagemagick was installed during the system install.

I have tried using the OSM maps, but they do not display. When I start Xastir in a terminal i get the following:

Magick: No decode delegate for this image format ().

Could not allocate canvas to hold tiles.

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General :: Loading TomTom Nav 5 Maps To IPAQ

Jul 14, 2011

Using Linux and have an IPAQ that would like to get TomTom Navigator 5 running on. I've loaded TTN 5 exe on the IPAQ, but have not been able to get the maps loaded. The CD has the files listed as .CAB files, and I have used "cabextract" to extract those files to a directory in Linux. When I use the "file" command, I get that the extracted files are "Microsoft WinCE install header, architecture independent, 10 files, 1 registry file". Do not need TTN5 running on the PC, just want it on the IPAQ. The maps will be on an SD card as is the TTN5 exe. Still get "no maps found" error from TT5 on IPAQ with all the files extracted from one region map put onto the SD card.

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Debian :: Google Maps Street View And Iceweasel

May 20, 2015

I've been a Debian convert for several years now, and generally use the Iceweasel browser (currently 31.7.0) supplied in the Debian repo. I've noticed that since Google Maps added 3-D effects to its Street View interface, and changed things up a bit, that it siezes Iceweasel. You can't "drive" the streets without the screen hanging. I'm running Debian 8 AMD64, and the free Noveau drivers for a Radeon 7570 video chipset. And I duplicated the problem on another PC with an onboard Intel video chipset.

Here's what I attempting in debugging things:

1. Installed the latest Adobe flash (not sure this was necessary).
2. Tried using the non-free ATI drivers, but ran into issues and removed those.
3. Tried tinkering with about:config webgl settings -- but there's a number of those, and I didn't know the minimal number to tweak, so I reverted back to defaults.
4. And unless I'm simply missing something, the "Lite View" option for Google Maps seems to have recently disappeared.

So Google Maps Street View still wasn't working. Then I stumbled across some references to using "force=webgl" as an URL parm in Google Maps: [URL] ....

Out of curiosity then, thinking the issue is not at my end at all, I downloaded the User Agent Switcher for Iceweasel and changed my agent's response to the latest Firefox on Windows 8.1. Reloaded the Google Maps Street View, and bingo -- it works great. Google doesn't like Iceweasel because of that name in the user agent?

This is a klunky method of using Street View, and I have filed an issue with Google (but I give that about as much odds as writing one's congresscritter). Or is there some easier way to use Iceweasel with Google Maps Street View by making more about:config webgl tweaks?

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Server :: Postfix As Spam Mailscanner To Protect Mail Server Running Sendmail?

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:

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


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Server :: Sended Mail Go To Trash Folder Of Reciver Using Postfix In Smtp Server?

Nov 26, 2010

my postfix to send and recive external emails, but many recive in trash folder.Other programer say me that is need some configurations in postfix with and dovecot to work, but i dont know what!This is my first time configuring a linux server at this week.

my main.conf
sample_directory = /usr/share/doc/postfix-2.3.3/samples
readme_directory = /usr/share/doc/postfix-2.3.3/README_FILES


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CentOS 5 Server :: Configure Postfix On 5 To Relay Email From The Internet To The Exchange Server

Apr 24, 2011

i need to configure postfix on centos to relay email from the internet to the Exchange Server and i also need that emails sent from the exchange within the same domain be sent to postfix then resent to exchange because i have spamassassin and clamav installed on centos to filter all incoming and outgoing mails ...

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Server :: Basic Postfix And Dovecot Mail Server For A Test Environment?

Sep 16, 2009

I did a a basic install of postfix and dovecot instead of using courier-pop and courier-imap. This is only send and receiving e-mail locally within the test network 10.7.0.X and 10.0.0.X. I used:


my postfix.conf is;

PHP Code:


This is the error when I send an email from a local machine on the 10.0.0.X network.

PHP Code:

Jan 20 17:05:48 testbox postfix/smtpd[2491]: warning: Illegal address syntax from unknown[] in MAIL command: <test@> 

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Server :: Postfix Rejecting Self-signed Cert On Remote Smtp Server?

Jun 24, 2011

I've got an uber simple test mail script in php on my awesome new dev machine running Ubuntu:

PHP Code:

Unfortunately, something is preventing mail delivery. I can't tell from this error log whether it's the remote machine rejecting me or whether it's my machine rejecting the self-signed cert on the remote machine:


I'm wondering what I could change in my postfix configuration to remedy this problem.

I tried setting smtp_tls_security_level = may = may but this did not change anything.

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Server :: Postfix Relayhost Not Working, If Domain Hosted On Same Server, But MX Points Outside?

Jun 23, 2010

i compiled and install postfix, and i using relayhost that point to my ISP. but my "DNS server" is on the same server where is installed postfix. and there is running apache with vhosts so i have domain that hosted on same server and in zonefiles of my domain my MX records points to Google Apps, to google's MX servers. But when i try send E-mail via sendmail to it not deliver mail to Google Apps totally, if i try to send to another E-mail everything fine it deliver it. so finally i done research this problem in Internet. And find that need to disable deliver mail to localhost(localdelivery)as i think postfix understand that the domain point to the same server where postfix have itself. and try to deliver mail local. but zonefile MX record even the domain on same server can point to another server outside. So i disabled localdelivery in postfix. and problem not fixed

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