Server :: Sendmail For Inbound Mail And Redirecting Them Internally To Other Port?
Mar 22, 2011
I have configured a sendmail MTA for incoming mails in a network and by using IPtables i have redirected the traffic internally to other port where one more SMTP by a application is running.Iptables rule:
iptables -A INPUT -i eth0 -p tcp --dport 25 -j ACCEPT
iptables -A PREROUTING -t nat -i eth0 -p tcp --dport 25 -j REDIRECT --to-port 25000
My sendmail config is as below.
Sendmail.mc
define(`SMART_HOST', `relay:host.subdomain.mydomain.com')dnl
dnl # define(`RELAY_MAILER',`esmtp')dnl
[code]...
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May 3, 2011
When I run 'sendmail -bv', it sends the mail delivery status report as a mail to the root. Is there a way I can redirect this to the console instead of sending as a mail. requirement is to programatically find the mail host of the recipient for which I thought of using this 'sendmail -bv' command. Is there any other better way to find mail host of the recipient
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Jul 12, 2011
i've got a software that uses a specific tcp port e.g 11111. i want to redirect all the traffic from 11111 to squid port 3128. i'm using the following commands to redirecting:
iptables -t nat -A PREROUTING -p tcp -m tcp -i eth0 --dport 11111 -j DNAT --to 192.168.0.1:3128
iptables -A FORWARD -p tcp -m tcp -i eth0 --dport 11111 -j ACCEPT
my ubuntu server has two interfaces. eth0 is for local network (dhcp assigns ips) and eth1 is for internet. my ubuntu server acts as a gateway and as an authentication server for users.
at squid also i have the following configuration regarding my port:
acl myport port 11111 http_access allow CONNECT myport. my squid installation is not transparent as users need to authenticate in order to access the web.
my application is a windows application and of course is not working. i examined the packets with wireshark and i noticed that when the program tries to access the internet, squid replies with err_invalid_request (the packet contains that data). the program is trying to send some plain text via port 11111 and as far as i can image, somehow squid declines the data. i cant get rid off squid as i want to pass the traffic from squid. what is the problem?
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Feb 5, 2010
possible to run Qmail and Sendmail on one server, both on another port? I need qmail for Plesk and sendmail for OpenEMM Now qmail is working for plesk, but if I install qmail ( I tried install it also from source) and try to run sendmail, I still get this error: Starting sendmails: listener sendmail: illegal option -- q chich probably means, that there isnt full sendmail version.
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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:
<postmaster@localhost.@mydomain.com.>... Real domain name required for sender address (in reply to MAIL FROM command))
Jul 27 13:15:59 smtp postfix/local[28465]: C68AC1000001: to=<root@smtp.mydomain.com>,
[code]....
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Jun 7, 2010
After searching the forum I could not find a clear answer to my question so I am giving it a try...
I have installed a LAMP server with Postfix as mail server. The scripts send email as user www-data using the mail server on the same machine.
However, the email got rejected by external mail servers (failed reverse DNS check) so I setup a mail server that meets all needed requirements.
Now I would like to use this second server instead of the mail server on the LAMP server. I found that this could be done with changing sendmail settings in php.ini (I think).
However I am not sure how that will go: www-data is no actual user on the new email server (which requires authentication before sending). Do I need to create a new user on the email server or change the settings in php.ini to match an existing user?
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Feb 24, 2010
I have users [URL] unable to send email to [URL]. [URL] user also unable to send email to [URL]. But both email addresses are fine as they can receive email from others or from [URL] and [URL]. I able to telnet mail server 110 and 25, no problem. Version: ESMTP Sendmail 8.12.10
Mail Log:
Feb 23 11:36:35 mail sendmail[16228]: o1N3aZxt016215: to=<xxx1@gas.com>, ctladdr=<xxx@abc.com> (501/501), delay=00:00:00, xdelay=00:00:00, mailer=esmtp, pri=442918, relay=gas.com, dsn=5.1.2, stat=Host unknown (Name server: gas.com: no data known)
[code]....
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Jul 20, 2010
I have installed Centos 5.4 with Sendmail 8.13.8, i have modified sendmail.mc file and compiled to sendmail.cf with following lines
1. TRUST_AUTH_MECH(`EXTERNAL DIGEST-MD5 CRAM-MD5 LOGIN PLAIN')
2. Define define(`confAUTH_MECHANISMS', `EXTERNAL GSSAPI DIGEST-MD5 CRAM-MD5 LOGIN PLAIN')dnl
3. DAEMON_OPTIONS(`Port=smtp, Name=MTA')dnl
My problem is that when i try to open port 25 with telenet it takes lot of time like more than 1 minute to open session and another 30 - 40 seconds to respond to "ehlo" command.
Also when i try to open telnet session on port 25 in another server it hardly takes 1-2 seconds open session.
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Apr 7, 2010
I have sendmail running in system,i want to send mail to other accounts like gmail,yahoo using this sendmail.What should i do ?
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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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Jan 6, 2011
We have a application hosted in our server and it uses send mail for sending and receiving mails.mails can able to reach certain ids but it cant reach some ids. this is the log entry.
Jan 6 00:52:18 p2234270 sendmail[11009]: p046hWi5011897: to=<dinesh@heatstream.com>, ctladdr=<apache@p2234270.pubip.serverbeach.com> (48/48), delay=2+00:08:46, xdelay=00:00:01, mailer=esmtp,
pri=4530999, relay=smtp17.msoutlookonline.net. [64.78.22.100], dsn=4.1.8, stat=Deferred: 450 4.1.8
[code]....
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Mar 3, 2010
setup a mail server using sendmail on Redhat 5/Centos 5.
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Feb 18, 2010
So I'm having troubles setting up a mail server. First of all, anyone want to try to telnet into <snip> on port 25 and see if it's blocked? I don't think it is, but you never know. How long does it usually take for MX records to get around? I've had this set up for about a day now and still don't see any MX records on any lookup site I go to. I'm currently using slackware 12.2's default sendmail configuration. Should I change anything? I started sendmail on my laptop and got emails going within the LAN but I cannot send emails over WAN (i.e. to/from yahoo or google accounts).e?
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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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Jan 5, 2011
i have configured sendmail server in my lan and it is working fine for me.but there is one little problem for me. i want mails send sunita should be received by vinita.sunita and vinita both are normal users on same pc.
for this i made entry in
Code:
/etc/aliases sunita: vinita
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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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Sep 22, 2009
i have fedora5 installed on my machine MACH1, which acts as a linux server for few machines. Its over network and we have a dedicated mail server too which is globally accessible. I wanted to set up a local mail server on MACH1, so that i shall be able to send/receive mails from all the users as well as to our other global mail server(on internet).
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Jun 1, 2011
I have configured Sendmail client to send mail to outside network ( Within local domain ), but i am unable to send any mail as i am getting the following error,
[root@cclx10 mail]# cat test |sendmail -v abhilash-o.padmanabhan@hp.com
abhilash-o.padmanabhan@hp.com... Connecting to [127.0.0.1] via relay...
abhilash-o.padmanabhan@hp.com... Deferred: Connection refused by [127.0.0.1]
I have the following configuration in my "/etc/sendmail.cf" file
# SMTP daemon options
O DaemonPortOptions=Port=smtp,Addr=15.146.237.113, Name=MTA
And netstat is showing that sendmail is listening on Port 25 on the IP address which is mentioned.
[root@cclx10 mail]# netstat -an |grep 25
tcp 0 0 15.146.237.113:25831 0.0.0.0:* LISTEN
tcp 0 0 15.146.237.113:25 0.0.0.0:* LISTEN
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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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Mar 18, 2009
Is anyone can help me how to setup sendmail ( Centos 5.2 ) as mail relay for Microsoft exchange. I will put the mail relay in DMZ and Mail server in Local Network.v
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Jul 13, 2010
I have been trying to set up ssmtp so I can send email using Gmail's ssmtp servers. However, when I try to send mail (using mailx), I get the following message:
Code:
Can't send mail: sendmail process failed
Here's the last line from dmesg (the only one applicable, according to the timestamps and message content):
Code:
[484114.608378] sendmail[17975]: segfault at 0 ip b7dbbbf3 sp bfb0dc4c error 4 in libc-2.11.2.so[b7d44000+14e000]
Here's my ssmtp.conf:
Code:
#
# /etc/ssmtp.conf -- a config file for sSMTP sendmail.
#
[code].....
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Jan 22, 2011
I'm currently running Ubuntu 10.10 Server using VirtualBox 3.2.12 r68302. I've setup a LAMP Server and Installed Redmine and I'm going to be starting some projects. The problem I have is that I've linked it to a subdomain thru my hosting, so things are a little more complex for me then usual. Here's the software I've added for this setup:
Ruby version 1.8.7 (i686-linux)
RubyGems version 1.3.7
Rack version 1.1
[code]...
how mail server functionality works as well as how to properly set the host of the virtual pc.
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May 14, 2011
Sendmail isn't sending mail for some reason and keeping it in the Queue. I attemped to flush them but it deferres the connection to the server in which it is trying to relay the message to. I have checked to see if there is a DNS error or anything like that. I attemped to flush the messages through webmin.
This is the result.
Code:
I am not finding anything in the logs to let me know their is an error. I can ping the mail servers that it is trying to send to. Now it has started delaying when ping MX servers. So I knew something was starting to mess with it. I have checked the /etc/hosts. It is correct. The server isn't black listed. Mail to root just gives me.
Code:
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Jun 21, 2011
I try to configure nagios server in my network. In nagios server I need to configure sendmail rely agent. I configured sendmail like given below
Code:
dnl #DAEMON_OPTIONS(`Port=smtp,Addr=127.0.0.1, Name=MTA')dnl
define(`SMART_HOST', `mail.mydomain.com')dnl
define(`RELAY_MAILER_ARGS', `TCP $h 25')dnl
define(`ESMTP_MAILER_ARGS', `TCP $h 25')dnl
[code].....
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Jan 29, 2010
I realized there are often weird yahoo connection on my mail server (SCALIX sendmail).
on ps aux | grep yahoo , i get a lot of connections such as these:
I get about a dozen of it, i think it is taking up my connection, anyone has any idea why how these connections appear? Is it because of my server's security loophole?
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Jul 31, 2009
i currently installed centos 5.3 with postfix. My old server is centos 4.5 final / new 5.3 final. Old server has sendmail / new has postfix. how can i transfer all the mail and settings from the old to the new? also, the old mail server is mail.xxx.xxx and for testing purposes i named the new mail server mail2.xxx.xxx.
when i an ready to put it into production, the new server will need to be mail.xxx.xxx and the old removed from the system. How do i go about changing the name and making sure everything comes out correct?
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May 5, 2010
I have a question, on my firewall at work I am seeing a constant flow of denies from many different source IP addresses, of tcp/udp destination port 53372 & 53375.What in the world is that, and why these two ports over and over
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Feb 1, 2011
I'm simply trying to make a little restriction on www packets under two rules:
1. Allow inbound/outbound www packets (works!)
2. DROP inbound traffic to port 80 from source ports less than 1024. (DOES NOT WORK!)
Now, technically, when i use hping to test my rules, hping3 192.168.100.100 -S -p80 -s 1023 I should NOT receive any packets. However, i still receive packets, which means my rule that says less than 1024 does not work. (see below)
And this is my iptables rules in shell-script so far:
#!/bin/sh
DEFAULT_NIC=eth0
SERVER_IP="192.168.100.100"
ALLOWED_WWW_PORT=80
IPT="/sbin/iptables"
[Code].....
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Aug 5, 2010
how to setup sendmail ( Centos 5.2 ) as mail relay for Microsoft exchange. I will put the mail relay in DMZ and Mail server in Local Network.
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