Networking :: Sendmail Sending OK / But It Never Arrives.
Jan 24, 2010
Sendmail will send letters OK, but they never show up. I cannot recieve with dovecot either. Everything seems to be OK, but it never works. I can send and recieve from localhost, but nothing outside.
The router is listening on 143, 110, and 25, and is forwarding just fine, or my site probably would not be visible.My HTTP site is at geekinsnthings.homelinux.org, the other address visible in the output is for anything else. THis is because geekinsnthings.homelinux.org redirects me to 8080 on my IP.
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Mar 12, 2011
I'm currently running a server at home with F13. Now I've set up my sendmail config to relay through another server because my ISP blocks outgoing email. Now recently I've noticed that they have stopped this server from relaying emails so i need to sort out another way to send out.My current sendmail config has this added which was the relay server i was using.
# "Smart" relay host (may be null)DSrelay.02broadband.co.uk
Now i either want to set up the server to email through my main ISP using a username / password or go through my main email provider Gmail.Any ideas on how to set up either on Fedora? I've seen guides for setting up gmail but never anything related to Fedora and I'm a bit stuck
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May 10, 2011
I've searched high and low for an answer. This seems so simple...
Domain = chadmccan.com
Server 1 = admin.mo.chadmccan.com
Server 2 = leroy.mo.chadmccan.com
Email for my domain is handled by Google Apps. MX records point there, I receive a ton of email there.I have 2 systems. admin.mo.chadmccan.com, which is designed to be the "gateway" for all services, including email.On the same network, is leroy.mo.chadmccan.com. It's just an application server, for random apps, including a webserver.I just want all of my systems to email anything that goes to "root" to blahblah@chadmccan.com relaying via admin.mo.chadmccan.com. Is this impossible?
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Sep 10, 2010
I can send mail through telnet and the recipient receives the email, but I cant send it through PHP.
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Nov 30, 2010
I am facing a problem while configuring a sendmail AS MY MTA.My problem is when is try to send mail from root to local user account(Any user existing in my local machine) , i m getting a unknown user error but normal users can successfully send a mail to root but root account does not.I can successfully compile a sendmail.mc without any error and sendmail deamons start successfully.When I Try to send mail from root account to local user Account , i got a Returned mail:see transcript for detail (which Has A following Detail )
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Apr 22, 2010
I want to know is it possible in Sendmail to restrict some users from sending / receiving mail to / from outside world i.e. they should be able to send and receive mails only from local domain.
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Jan 31, 2009
I want few users to have access for sending mails in sendmail and others not.
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Jun 22, 2010
Please tell me how i can block sending or receiving .exe files as a attachment in sendmail server
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Jan 7, 2010
I have a 64bit linux server with 5 virtual hosts on it. When someone fills out a contact form on one of the sites...I get 15-20 copies of the same email. At first I thought it was the kids clicking send multiple times because the first emails were coming from the children's ministry "Email The Cast" section. But then I started getting multiples from the adult sites too. All contact forms are set to come to me.
What's stranger is that my registration section for one of the sites uses the SAME php script (different file) to email me a notification that someone has registered but I only get 1 copy of that.
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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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Oct 9, 2009
this is sasidhar. we are getting problems with sendmail. we have a site, when user registers we are sending a confirmation mail to user. The problem is some times it is not sending mails to users. The user accounts are valid.This is what I am getting reply to my mail
[Code]...
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Apr 13, 2011
I had a simple cron shell script running under Fedora 14. It runs under a user account. The shell script invoked a PHP script to do some simple batch database updates. If a step failed, the PHP script used the mail command to email me of the failure.
The problem is that an email from this job is arriving every day at 4:30 am. I deleted the job from the cron. I even renamed the shell script to make sure! The email is an old one and is stuck somewhere and I don't know where. I restarted the sendmail service and that did not clear it. I don't even know why it happens at 4:30am! At one time the cron ran it at 4:30 but now its not even in cron! And as I said, I renamed the shell script to make sure.
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Feb 11, 2011
I am using Microsoft Oulook Web App. It is set to play sound whenever a new mail arrives but it doesn't play. I am using Ubuntu 9.04. what needs to be done to make it work?
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Nov 1, 2010
I am using webmin for my daily tasks. I have fedora 13, whenever I click on ''Sendmail M4 Configuration'' or Outgoing Addresses (generics)'' I get the following error message
Quote:
The Sendmail M4 configuration base directory /usr/share/sendmail-cf was not found on your system, or is not the correct directory. Maybe it has not been installed (common for packaged installs of Sendmail), or the module config is incorrect. I read documentation at sendmail.org, it seems that structure of directories for send mail has been changed in version sendmail-8.1.4 shipped with FC13. In webmin config module we have
Quote:
Sendmail M4 base directory = /usr/share/sendmail-cf
which is not there. I did a locate / sendmail-cf on the command line, it finds nothing
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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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Apr 1, 2010
I recently modified sendmail.cf to use a third party SMTP server to send emails. It works great. But when I run sendmail from the command line, I have to specify the -C flag and force feed it the location of my sendmail.cf, or else it doesn't work.
So in other words, the following works great:
However, if I don't specify the -C flag, sendmail doesn't consider what's in the sendmail.cf and barfs:
I don't run sendmail as a daemon. I'm only using it to send emails. I know my modifications of sendmail.cf are correct because it works perfectly when I use the -C flag. I searched my disk to see if I could find another sendmail.cf on the machine and only the one in /etc/mail came up.
Why sendmail is not reading my sendmail.cf?
I'm running Sendmail version 8.14.2 on Fedora Core 8.
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Dec 15, 2008
I have installed qmail in centos 5 machine. After the installation , the qmail is not able send mails. The output of the qmailctl stat is
[root@testserver qmail]# qmailctl stat
/service/qmail-send: up (pid 28409) 168066 seconds
/service/qmail-send/log: up (pid 20217) 1 seconds
/service/qmail-smtpd: up (pid 20210) 2 seconds
[code]....
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May 23, 2009
I have a laptop (running Fedora 10 KDE version) and a desktop (running Ubuntu 7.10) on my home network. Is there any way to send messages from one computer to another through LAN ?
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Dec 10, 2008
I am not a networking expert by any means (in fact I have never taken a networking course), but I have taken several security courses, and generally we wind up discussing replay attacks. For example, the Needham-Schroeder protocol (using symmetric-key cryptography anyway) is flawed because it allows for replay attacks, and I understand why.
I guess my question is actually how someone would perform a replay attack. I know I can sniff network traffic by downloading wireshark. I also have downloaded winpcap and npg on my WinXP virtual machine. I'm trying to use this guide to help me, but I'm quite lost:[URL]What I did was to post a "link" to my facebook profile and I sniffed the traffic using wireshark. What I would ultimately like to accomplish is to copy that packet out of the wireshark output, and then use a tool like npg to transfer the raw packet back to facebook, which should result in a second, redundant post. I just can't figure out how to do that.
I'm pretty sure this should be possible. Facebook only uses an SSL session for authentication during login. After that, the information is just sent in the clear, so I'm pretty sure this should be possible.Can anyone explain how to do such a thing? It would really help my research paper that I'm working on this semester if you can. As of right now the attack we are trying to demonstrate/defend against is using a Windows VM, which is why I'm using winpcap/npg. The attack is actually possible using just about any OS (depending on the exploit used), but our POC is Windows only at the moment
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Jun 10, 2009
Suppose I have computer A with ip address on eth0 of 192.168.0.1 and ip address on eth1 of 192.168.1.1. If I send packets to 192.168.1.1 from computer A, it automatically uses the loopback interface. Is it possible to modify the routing table some how to send these packets out on eth0 instead and have them route around the network and come back on eth1.I've tried 'route add -host 192.168.1.1 dev eth0' but it seems to completely ignore this entry.
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May 12, 2010
I have an issue when sending snmp traps. I have an embedded system connected to a SNMP manager. I am sending traps from the box to the manager continuosly. After sometime I don't see any trpas coming out.
I get this error message.
Cannot open file /proc/net/tcp ...
: Too many open files
Cannot open file /proc/net/snmp ...
: Too many open files
What could be the reason for such an error?
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Apr 6, 2010
I'm hosting a Sendmail Cyrus-Imap server on fedora 12. I recently installed a second NIC on a second internet gateway and successfully configured source based routing. Clients are able to connect over the mail.domain.com received from the gateway 192.168.0.1 to the interface 192.168.0.254. ETH0. Clients are also able to connect from pop3.domain.com and smtp.domain.com from the second gateway 192.168.1.1 to the interface 192.168.1.254. ETH1
I have cyrus-imap certs configured for the mail.domain.com and a Sendmial cert configured for mail.domain.com. My question is how would I tell sendmail and cyrus that the mail.domain.com goes out the ETH0 but deliver the second and third cert (eg cyrus sends pop3.domain.com and sendmail sends smtp.domain.com) to clients connected on ETH1?
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Apr 28, 2011
I have created this thread as it sis realy hard for me to send traps from my Linux workstation... I m lost with v1/v2/v3 snmp... So here is the initial configuration: (without traps)
rocommunity myrocom
rwcommunity MyL33tP4ss 10.5.32.202
rwcommunity MyL33tP4ss 127.0.0.1
syslocation "FR"
syscontact root
From there i can "poll" my system. But what should i do if i want my Linux system sending traps when disks are full or system overloaded etc...I have found information on Internet but not easily understandable It is for v3:
rwuser admin
createUser admin MD5 mypasword
#
# From there i would have to comment the lines regarding the communities
#
[code]....
10.5.32.202 is my management host ... is this config ok ? But it seems that trap2sink is for v2 ? How does it work ?
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Feb 13, 2011
My two machines are both running Ubuntu 10.10. I want to transfer program files between them using a local area network.
My Ubuntu machines can both see the Window machines on the network, and get files from them. But my Ubuntu machines do not detect each other as being on the network. Nor can my Windows machines detect my Ubuntu machines.
From what I can tell, that's normal, and I've become resigned to using a pendrive to transfer files between the two machines. Or even sending files as email attachments.
there is a clean and easy way to transfer files between two Ubuntu machines on the same local area network.
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Aug 19, 2010
I wrote an application that receives packets on one interface and sends them to another interface after it added a vlan header. Both the sending and the receiving is done using raw sockets. Everything seems to work fine until I get TCP packets that are of size 1514 (MTU). Once I add a vlan header to the packet, its size becomes 1518 and when I try to send it I get the returned value -1 and errno=90 (message too long). I tried to change the MTU of the NIC to a value that is bigger than 1500 but that fails. If I create a bridge using brctl and vconfig between the NICs I can see that my NIC does sends packets of size 1518. What do I need to in order to make my NIC to send packets of size 1518?
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Oct 13, 2010
I want to build a topology of this kind:
|eth0 (a.a.a.a) |
Linux PC |<----------------> | ROUTER
|eth1 (b.b.b.b) |
|<----------------->|
the linux machine has two interfaces eth0 (a.a.a.a) and eth1 (b.b.b.b) connnected to two interfaces of a router. Now that if I send any packet destined to b.b.b.b from a.a.a.a interface on the linux machine, it should take the folowing path: eth0->router->eth1 . and it should be the same for vice versa.
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Jun 16, 2011
I implemented postfix as mail gateway but i need to block the ability to send
mails via telnet
How can i achive this?
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Jan 11, 2010
I am doing a university course and am struggling to find a method of sending 1 message down route A and then the next message to the same destination via route B, alternating between the two with each new message sent.I am going to use a Linux computer with two Ethernet cards connected to two different networks via a routers and then to the destination host via a switch.
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Jun 20, 2009
i have problem in sending emails using outlook on my client machines i.e XP i am getting the error Relay access denied. i am using fedora 9 as our server. with dovecot and postfix and fetchmail.it was working fine previously .
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May 31, 2010
I am very new to linux. I have to build a netwrok for small lab and office setup. Setup as below I have a PC running with Centos 5.4 and has 4 NIC cards. eth0, eth1, eth2 and eth3.
eth0 --- Connected to DSL and getting the Public IP address using PPPoE.
eth1 --- 192.168.4.1 statically configured on the interface
eth2 --- 192.168.5.1 statically configured on the interface
eth3 --- 192.168.6.1 statically configured on the interface
[Code]...
I am able to browse from all the hosts behind each nic cards. But mails from outlook not working (sending and receiving). I have configured gmail in the outlook with imap and smtp. I tried allowing the port 25 using follwoing command, iptables -A INPUT -p tcp --dport 25 -j ACCEPT . let me know what should be done to access mails from outlook
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