CentOS 5 :: Switching From Sendmail To Postix?
Oct 14, 2010
I'm contemplating to switch from sendmail to postfix. My current setup is very simple: a minimal CentOS 5.5 64bits install with Selinux enabled on ports 25, 80, secret sshd, 53 and 953. I also use Google Apps for my domain to manage the email accounts. Basically, I use sendmail only to email the daily logwatch, as well the email sent from my forum software. The issue that I'm facing is the forum is starting to hammer sendmail with a lot of emails.
My goal is to use Postfix only to send those forum emails. I don't need a SMTP setup, that is handled by Google Apps. Can I do that with Postfix? Will Postfix perform better than sendmail? All guides I saw on internet pair Postfix with Dovecot and the setup is a little complex, not to mention that I will never have email accounts created on server.
I was wondering if you have any handy guide who will basically replace sendmail with Postfix. Personally, I tried myself using the CentOS HowTo. I yum'ed postfix and system-switch-mail, then I disabled sendmail and switched the agent to Postfix. I left the main.cf config unchanged and tried to start Postfix (service postfix start), but I got a "master is stopped" message when I checked the daemon status.
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May 13, 2010
I setup postfix and got that accepting emails without any problem. I tried to setup amavis to use ClamAV and spammAssasin and now i am not receiving emails. Mail log has multiple lines like the one bellow.
May 11 06:23:34 secure postfix/qmgr[21522]: warning: connect to transport amavis: Connection refused
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Feb 9, 2010
I've tried to install and configuring postfix and courier-imap on my virtual server. It can send e-mail (because I do it by gmail ) and it can receive the mail from itself to. I've set a thunderbird account and it can read all mails in my mailbox. The problem occurred when I try to send an e-mail from an external domain to my domain. For example if i try to send an e-mail from example@gmail.com to example@mydomain.com, after few seconds in gmail account compare the mail where it says:
Delivery to the following recipient failed permanently:
example@mydomain.com
Technical details of permanent failure:
Google tried to deliver your message, but it was rejected by the recipient domain. We recommend contacting the other email provider for further information about the cause of this error. The error that the other server returned was: 550 550 #5.1.0 Address rejected example@mydomain.com (state 14). I can connect to my server by telnet on 25 and 143 ports. On 143 login successful. The mail log file has no changes when I try to sent an external email to my mail server so I don't know if it's a server/postfix problem or DNS problem or what else.
This is my main.cf postfix configuration file:
# 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.
#myorigin = /etc/mailname .....
MX record contains mail.mydomain.com and I have inserted a A record on my DNS manager that link mail.mydomain.com to my IP addres. In fact I can connect myself to mail.mydomain.com on 25 and 143 ports. So i think that configuration file is right.
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Mar 20, 2010
I have a computer with the release candidate of Windows 7 (which is now expired) that I'm intending to switch over to CentOS. Is there anything I should do(besides backing up files) before I try to install CentOS?
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Mar 26, 2009
I just installed PHP 5.2 using this guide [url]
The install did work without errors and is listed correctly on yum but isn't working when I test a php script.
So now I need to downgrade back to the php 5.1 but yum is now stuck on this atomic repository, how do I get back to the Centos repository and downgrade PHP to 5.1?
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Nov 23, 2009
my problem is i have setup 2x ppp used for adsl to split local and international bandwidth ppp0 is using the international account and ppp1 is using the local only account this all works fine but every so often i notice when i do an ifconfig that ppp0 is dialed up on the local account and ppp1 is dialed up on the international one, and sometimes a reboot fixes it and sometimes it doesnt
my config files are the following:
# Default ADSL network config file, as used by redhat
USERCTL=yes
PEERDNS=no
TYPE=xDSL
[Code].....
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Jul 15, 2010
i'm using centos 5 and i want to save my setup when switching the user.when i switched user from user1 to user2 and then i logged in user1 back without shutting down, i couldn't see any working window on user1. But since it's working on the CPU, i guess it's working but i cannot just see the window(such as terminal in my case) i was using. i have been using scientific linux which have "save current setup" when logging out. but centos seems not to have that check box!i want to know whether centos can contain the setup for each user when switching user.
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Jun 13, 2010
I'm a long time user of CentOS 5 w/KDE 3.5. I have always had this problem to various degrees no matter what installation of CentOS 5 I'm currently on. This same hardware does not exhibit the same symptoms with another OS.The problem is I regularly have many konsole instances open. I alt-tab between them frequently. Inevitably a random alt-tab will freeze the keyboard and the mouse won't be able to click anything although I can move the mouse cursor around. I can't type anything. It seems to have some sort of timeout and it always come back to responsiveness.
I alleviated this problem (I think) by switching keyboards, installing the nvidia driver instead of the nv driver, shutting down all non-essential services.I have seen these symptoms on every system I have installed CentOS 5 where KDE 3.5 was also installed. Very different hardware setups each time.Has anyone else run into similar symptoms?I'm surprised that it's just CentOS 5 w/KDE 3.5 that exhibits this behaviour on the same hardware where other operating systems (gentoo, suse, etc.) did not exhibit these symptoms.
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Feb 19, 2009
Im unable to send mail using mailx or sendmail. The sendmail daemon is running.
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Sep 15, 2010
I'm working with a vendor on getting a web site certified for Payment Card Industry Data Security Standard for processing our credit card transactions. The vendor's running Centos 5 (which we also run at my business). The current issue has to do with sendmail, which the required PCI security scans say should be upgraded to 8.14.4. However, the vendor points out that latest version packaged for yum on Centos 5 is 8.13.8.
I'm still somewhat of a newbie at this, but from my reading, it seems that installing the 8.14.4 sendmail means using 3rd party repositories and potentially breaking the system. I browsed through "Installing RPMforge" on Centos wiki, which notes that a complete listing of the over 4000 RPMforge packages is at [URL]. Scanning that link shows sendmail packages with lower numbers than what's currently installed, 8.13.8. All I see on sendmail.org are tarballs of the latest verson, 8.14.4, available 2009-12-30. I presume this means you must install from source; I'm not sure the vendor's comfortable with this, especially for such an essential service.
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Aug 15, 2010
My Sempron LE-1100 home server (1GB RAM) has run CentOS 5 32-bit happily for years, but I decided to replace its two Seagate 250GB drives (RAID1) with two WD 500GB black drives (RAID1). I decided to do a fresh install and used CentOS 5.5 64-bit this time. Since switching to the 64-bit OS with the new drives, my transfer speed across the LAN has dropped from a reliable 45MB/s to only 18MB/s from other machines to the server, and to 27MB/s from the server to other machines on the LAN. I use gFTP or WinSCP for these transfers (in FTP mode). Prior to installing the new WD drives, I ran the long WD tests on them and they passed, so I don't believe the drives are faulty. I suspect it's more to do with me switching CentOS from i386 to x86_64.
I've got two questions:
1. Is the 64-bit version of CentOS appropriate for a Sempron LE-1100 with 1GB ram, or should I switch back to the i386 version?
2. Is there a reason why switching to the 64-bit OS would negatively impact on transfer speeds? I doubt the new HDDs are faulty...I was expecting them to be faster.
3. Is there anything I can try to improve transfer speeds across the LAN?
According to PHPSysInfo, the network card is "Ethernet controller: nVidia Corporation MCP67 Ethernet".
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Jul 19, 2011
I already have sendmail dovecot and roundcube webmail in my linux centos 5.6Problem is that i want to change mailbox format mbox to maildir because maildir is faster and stable.So i search about this and i see sendmail doesnt save in maildir format.Is there any way to change sendmail save format mbox to maildir.Or do u have any idea for it.
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Jul 7, 2010
I'm running CentOS 5.4 with sendmail. My computer hostname is bob.domain.com. Whenever I would nc -v 127.0.0.1 25 into sendmail I would get bob.domain.com on the banner. Whenever I send out email the emails would be user@bob.domain.com. I wanted the email to show up as user@domain.com. So in the etc/mail/sendmail.cf file I changed the line
Code:
Dj$w.hostname.com
to this
Code:
Djhostname.com
Now when I enter sendmail I see domain.com in the banner so I know the change took place. However, when I send email using
Code:
mail -s "test" xxx@xxx.com
then email still goes out as user@bob.domain.com. What other changes do I need to make?
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Feb 5, 2010
me sendmail configuration steps on centos, i need to define AUTHENTICATION parameters in this configuration.
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Mar 16, 2011
I run a CentOS server and would like to put a disclaimer message on every email that is send through that sendmail server.
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Nov 18, 2010
We have moved from a Windows based SMTP server to Sendmail on Cent 5.5. We have a special application that was written to look at the "BadMail" folder on the Windows box. I am told by my developers that it is capable of monitor remote locations and they just need to know the format or extension of the badmail files.
My question is what is the default location of the badmail folder in Sendmail? This is a default install from CentOS.
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Mar 3, 2010
setup a mail server using sendmail on Redhat 5/Centos 5.
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Jan 28, 2009
I recently turned on sendmail in CentOS 5.2 and configured it to relay mail for its domain onto some other email account elsewhere. Anyway, it's kind of hit and miss, but I've got a few of these:
Jan 27 21:47:18 smhi sendmail[12176]: n0S3YLaX011994: to=<kevin@hiding.my.domain.com
>, delay=00:12:56, xdelay=00:00:03, mailer=esmtp, pri=120673, relay=mx.hiding.my.mailrelay.com
[65.87.230.26], dsn=4.0.0, stat=Deferred: 451 4.3.0 Greylisting is active,
please try again later.
I don't think I have any greylisting software installed, but it seems to be greylisting? What's up with that? And why would it be intermittent? how I turn this off?
I've previously configured sendmail on Fedora systems and CentOS 4 and haven't run into this before...
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Apr 9, 2009
After upgrading to CentOS 5.3 my sendmail will no longer deliver messages using a program in my /etc/smrsh. It fails with the message "unknown mailer error 1". This program was working perfectly before I did the upgrade using yum. Here is the list of packages that were upgraded. Does anything jump out as being the source of the issue? I don't believe that sendmail itself was upgraded:
Packages Installed:
dbus-libs - 1.1.2-12.el5.x86_64
libselinux-utils - 1.33.4-5.1.el5.x86_64
Packages Updated:
initscripts - 8.45.25-1.el5.centos.x86_64
[Code]....
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Apr 30, 2009
I would like to send the logfiles and the CallDetailRecording-files of my Asterisk-server weekly to my email-address.
But I'm having some issues...
This is the command I would use in a script :
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Jun 23, 2009
I am trying to make my webserver a well respected email sender and it appears to me that using DKIM is something I need to do.
I have no experience with this and would like to know if anyone thinks there are issues that I should be aware of before going down this path.
Also, I have not been able to find any good, STEP BY STEP, documentation on how to set up DKIM with Sendmail.
I am also not sure if you need a certain network configuration for DKIM to work...this is what I am working with:
My webserver (centos 5.3, sendmail 8.13.8) sends outgoing mail and has a valid reverse DNS that matches a forward DNS. The MX records for my webserver's domain point to a third party email provider who handles the incoming mail for that domain. I added an spf record that signifies it that my webserver is authorized to send mail for mydomain.
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Aug 5, 2009
I have been trying to get procmail working on CentOS 5.2. I don't need anything fancy, just an auto reply for a "noreply@" account. Looking at the sendmail configuration, it appears procmail is the MDA. I have looked at many different tutorials and how-tos, but most are old, and/or the locations/paths and setups are markedly different from the defaults on my system. Can anyone recommend a good CentOS-based tutorial on Procmail w/ recipes? (I have an RHEL book and it's no help either.) Thank you for your time and consideration.
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Nov 12, 2009
We have CentOS 5.3 and are using sendmail for outbound emails. We are trying to switch over to authsmtp service. Authsmtp requires sendmail built with SASL suport.
How do I find out if my sendmail has been built with SASL support? If it is not, is it easy to build it with SASL support?
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Dec 23, 2009
I am using CentOS and sending mail through php mail function. It is taking too much time to send a mail.
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Apr 2, 2010
Sendmail does not work anymore.
//deinstaled everything
[root@localhost ~]# top -b -n1 | mail -s 'Process snapshot' mymail@mymail.net
/usr/sbin/sendmail: No such file or directory
//reinstaled everything, restart sendmail
[root@localhost ~]# top -b -n1 | mail -s 'Process snapshot' mymail@mymail.net
[root@localhost ~]# /etc/mail/submit.cf: line 544: fileclass: cannot open '/etc/mail/trusted-users': World writable directory
//fixed that with '-o' in /etc/mail/submit.cf, restart sendmail
[root@localhost ~]# top -b -n1 | mail -s 'Process snapshot' mymail@mymail.net
// in mail.log:
Apr 2 12:49:16 localhost sendmail[6252]: o32AnGis006252: to=mymail@mymail.net
, ctladdr=root (0/0), delay=00:00:00, xdelay=00:00:00, mailer=relay, pri=49856, relay=[127.0.0.1] [127.0.0.1], dsn=4.0.0, stat=Deferred: Connection refused by [127.0.0.1]
//test
[root@localhost ~]# telnet localhost 25
Trying 127.0.0.1...
telnet: connect to address 127.0.0.1: Connection refused
telnet: Unable to connect to remote host: Connection refused
//commented out #O DaemonPortOptions=Port=smtp,Addr=127.0.0.1, Name=MTA
//in sendmail.cf, restart sendmail
//test
[root@localhost ~]# telnet localhost 25
Trying 127.0.0.1...
telnet: connect to address 127.0.0.1: Connection refused
telnet: Unable to connect to remote host: Connection refused
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Apr 17, 2010
When try to yum install sendmail geting errors:
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Jun 3, 2010
how to install and setting (mail transfer agent) for sendmail..
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Sep 22, 2011
todo: I have now running sendmail with milters and auth, dovecot as lda configured with virtual domains / Local User, srs. on centos 5.x
I want to migrate to Postfix with:
at first step the same Local User now with Mbox and there Mails
same milter with macros for auth....
dovecot as lda
[Code]...
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Aug 4, 2011
currently i want to configure sendmail port number 25 im using these port numberalready how can i chage my senmdail port no.
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Feb 22, 2009
I have this server that runs Tomcat . this server sends mail with localhost as MTAthe local MTA is sendmail (with the default settings) . from time to time i have this strange thing and the emails it sends never reach the destination. the log shows it left the server , but looking at the logi see that the time on the log is wrong . sometime its correct and ometines its +2 hours. i guess this email are bounced at the destinationfor sending at future time . all this email that didnt reach the destination have this in common
Feb 22 15:47:44 BE00 sendmail[12969]: n1MDlikZ012969: from=<support@example.com>, size=5912, class=0, nrcpts=1,
msgid=<5269969.391235310464949.JavaMail.tomcat@BE00.example.com>, proto=ESMTP, daemon=MTA,
[code]....
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