CentOS 5 Server :: Configure The Sendmail Smart Host?
Dec 29, 2009
I have setup CentOS 5.2 with Nagios to monitor my network and have that configuration almost done. I have also setup Sendmail to forward all mail (really only Nagios notifications) out to my Exchange server using define('SMART_HOST', 'exchange.domain') in the sendmail configuration file and it seems to be working correctly.is there a way to configure Sendmail to forward all mail out through my Exchange server as it is now but send mail out to the internet itself if the exchange server is unavailable, somewhat like a failover configuration.
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Dec 18, 2010
I'm trying to setup sendmail to use my gamil account as a mail relay but with no success. I followed these guides: [URL]and many others.my machine is a centos 5.5 vm running under opensuse host. ( I hope that its not just a virtualbox problem..)
I ended up with this setup:
/etc/mail/auth/client-info:
AuthInfo:smtp.gmail.com �U:root� �I:xxxxxx� �P:xxxxxx� "M:PLAIN LOGIN"
AuthInfo:smtp.gmail.com:587 �U:root� �I:xxxxxx� �P:xxxxxx� "M:PLAIN LOGIN"
[Code].....
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Mar 23, 2011
dammit... all that typing and I hit the wrong "submit" button. *sigh*
Ok, I have a couple of SMTP servers for our infrastructure. They are running Postfix. I have them configured so that specific email addresses such as support@mydomain.com and billing@mydomain.com all go to a new support server that I am building with osTicket. Lets call that server SUPP1.
SUPP1 runs sendmail from the default install of CentOS 5 i386. At this point everything runs great. New emails get added into the osTicket system via a pipe in sendmail. Here's where the problem comes in. In order to accept mail, sendmail has to have the domain listed in local-host-names and the addresses in virtusertable. That works just dandy. But in doing so, sendmail believes it is the destination SMTP server for "mydomain.com". That means that I can't send mail from that server back into my normal SMTP servers. So things like the LogWatch, cron jobs, etc can't send notifications. Is there a way to work around that? For sendmail to ignore local-host-names for outbound email or something?
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Feb 21, 2010
I am trying to set up sendmail on my intranet (home) webserver, so that it will send mail via my ISP. I have searched for similar threads including this thread, but the responses do not seem to have solved the problem. All I want is to call sendmail from Perl, to post myself the responses to a test form I am building, using my normal internet mail address. I do not want to receive or relay mail from any host except the web server itself (127.0.0.1).
I have edited sendmail.mc to define SMART_HOST as my isp's mail server and MASQUERADE_AS to be my local network name (which is not a registered domain - it is just the name I have given my home intranet). I have run make and built a fresh sendmail.cf, then restarted sendmail.
Using my form, I am able to submit the message to sendmail, but after 40 seconds the mail log shows a message
Code:
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Mar 7, 2011
I have a CentOS 5 box that is a web server. When it generates emails, all emails should go out through our Exchange mail server.I believe our Exchange server requires NTLM authentication:
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Sep 8, 2009
Many of mails sent from my mail server that are in Queue;The main reason is deffered by domains like yahoo,aol,etc.but there is one more error that i keep getting and that is Host Unknown,Below is an example from mail log,The catch is,test mail sent on the same email id sent from my personal mail from the same server i.e. url was deliveredHowever,another mail containing client information sent from customercare@mycompanysdomain ended up in queue.
There are more examples of the same,around 20 domain have the same problem.
Sep 7 14:33:46 server2 sendmail[24591]: n8793jiC024589: to=<abc@xyz.fi>, delay=00:00:00, xdelay=00:00:00, mailer=esmtp, pri=163672, relay=xyz.fi., dsn=5.1.2, stat=Host unknown (Name server: xyz.fi.: host not found)
Sep 7 22:09:42 server2 sendmail[6407]: n87Gdffa006403: to=<abc@def-fgh.com>, delay=00:00:00, xdelay=00:00:00, mailer=esmtp, pri=152474, relay=def-fgh.com., dsn=5.1.2, stat=Host unknown (Name server: def-fgh.com.: host not found)
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Mar 11, 2010
We have a requirement to configure multiple email gateways, for mail accounts configured on linux server. the application will trigger mails (bulk mails) and we would like to configure multiple email gateway to be used.
we decided to do it this way.
In dns we would create MX records like
yourdomain.com. 3600 IN MX 20 realmailserver1.yourdomain.com.
yourdomain.com. 3600 IN MX 20 realmailserver2.yourdomain.com.
where realmailserver1.yourdomain.com. and realmailserver2.yourdomain.com. will be our email gateway.
and internally on our linux server (from which mail is sent) if i specify multiple smart hosts like
define(`SMART_HOST',`esmtp:realmailserver1:realmailserver2')dnl
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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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Aug 7, 2010
I changed the host name on this CentOS 5.5 machine but whenever I reboot the machine the startup pauses at the point of starting sendmail for several minutes and then eventually moves on. What could be causing this?
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Jun 14, 2011
It has been years since I had to mess with sendmail (I prefer using postfix) - but I inherited a server that someone else configured. This machine is a webserver - but is running sendmail for the various webforms, etc. I want to configure sendmail on this machine to route ALL outgoing messages to the main email server. This means local users too. I have read through sendmail configurations for the past 3 hours, but it's mostly greek. Here is my current sendmail.mc file - could some kind soul tell me what I need to change (and WHERE)?
[code]...
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Feb 25, 2010
1- how to config pop and imap on sendmail server
2- how to config smtp restriction on sendmail server
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Oct 5, 2010
complete steps for configuring Sendmail in Red Hat Linux 4 Enterprise.ve already configured my DNS server and it is functional
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Mar 19, 2010
I have to configure sendmail to send messages only and not receiving any mails on a linux server when the mail server is on another server.how to configure sendmail?
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May 12, 2010
I'm trying to configure procmail for sendmail but its not working. I added these 2 lines to sendmail.mc:
define(`PROCMAIL_MAILER_PATH',`/usr/bin/procmail')dnl
FEATURE(local_procmail)dnl
So my question is, where do I put .procmailrc? An examples I found on the net has the procmailrc in the users mail directory, but there are no user mail directories on the sendmail server. It is used purely to relay mail to the Exchange server.
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May 4, 2011
So I have two servers in my environment, I have an app server that runs my Java App on it and then I have a utility server. Right now, I have that utility server acting as a simple mail gateway so when my app server needs to send an e-mail out, it forwards it to the utility server and the utility server sends it out to where-ever it's destined to. The Java server always sends as one specific user, let's call it bob@company.com.
This set-up is working just fine right now. Now, I also have my company.com e-mail hosted at an e-mail provider for all of my user's e-mail accounts and such. I also have a bob@company.com e-mail account so if e-mails ever bounce, they end up in this inbox. Again, this works fine.
My app is pretty email dumb so it can't authenticate itself or anything, that's why I am using sendmail on my utility server instead of my e-mail provider's SMTP server. What I would like to do is to configure sendmail to forward all outbound e-mails (and authenticate) to my e-mail provider's SMTP gateway using the bob@company.com account and credentials. Is it possible to configure sendmail to do this?
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Apr 19, 2010
It seems my sendmail (running in slackware 13.0) cannot send out emails correctly. I guess I need to tell it what is the smtp server to use. And, I heard, gmail's smtp server is available to use for this purpose. How to configure my sendmail this way?
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Dec 15, 2009
I want to use imap account settings in MS outlook 2003/2007 with backup end Sendmail server. When i configure imap settings in MS outlook 2007 it shows mails are coming from Sendmail server , but another local Personal folder attched with outlook client. I have changed my settings so that every send items mail are coming under imap send-items folder ,but that extra folder stilli in place. I do not see any option how to remove this extra folder from my PST list.? As this never comes with if we are using MS Exchange.. Is there any way i can change my local delivery bydefault with IMAP folder only and save my Contact in IMAP Folder?
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Feb 10, 2010
how you I can configure sendmail to use 2 different configurations of virtusertable as access was being made from internal and external institution?
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Jun 2, 2011
I've been for a while trying to configure my apache to host 5 domains as virtualhosts in the same IP address, but seems that neither one makes it through... it always takes first one, because it is the default:
NameVirtualHost *:80
<VirtualHost *:80>
ServerAdmin xxxxxxx@xxxx.net
[code]....
As you can see I tried the ServerName with the http://, in quotes, without it...
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Apr 24, 2009
I am trying to set up a mail server on centos5 using sendmail and dovecot, and eventually spamassassin and some antivirus filter as well. I'd also like to get the proper secure auth mechanism set up at some point too. But for starters, I've been having a lot of difficulty trying to even connect to the mail server from a client computer in the local network. I installed Eudora on the client and after some tweaking in dovecot I was able to connect to the mail server, but then when I try to send an email I get a "connection refused" error, with nothing being logged on the server that I can see.
The last time I set up a mail server was Fedora Core 2, so the configuration files have changed a bit to say the least, and I can't really refer back to those to set up this new server. Does anybody know of a good step-by-step doc on getting the mail server going? I've read the man pages and other various readme's, but these really only list out the available options with no really good explanation of what needs to be done to get the mail server going. If there isn't a full write-up on how to do this, I'll put something together when I'm finished so others can use it in the future.
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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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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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