Server :: Sendmail - Block Email To Root From Outside But Keep Receiving From Inside
May 5, 2010
I have a small internal network with about 8 or so servers or workstations. My mail server is getting spammed from all over to the root and other administrative accounts. I also get valid email sent to the root and administrative accounts from within my local network. Is there a way to block all email coming from outside my local network while still receiving it inside the local network to these specific accounts?
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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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Jun 17, 2010
i am using centos 5.4, running squid for proxy, i want to block email sending and receiving of proxy users to secure my data. how is it possible that the proxy user can only brows websites but he can not receive or open and send or save as draft to mail box.
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Apr 29, 2010
Is there a way of allowing only certain domain to send e-mails to certain specific e-mail address. I am using Sendmail, and I have an alias which translate to certain members of staff within my organization. I don't expect e-mails from outside our domain to be sent to this alias e-mail address.
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Jan 29, 2010
I am setting up a new email server by following the Flurdy guide. I can send but I can't receive. I can telnet in with both the IP address & telnet mail.domain.com 25 I'm not using or loading shorewall because I will be relying on the firewall that is in the router. I have been following the test section of the flurdy tutorial. I am tailing the mail.log file and only see the status as being different from the example
"status=bounced (mail for domain.com loops back to myself)"
It seems like it is getting through to the server but then getting rejected.
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May 7, 2010
i can't receive outside emails on a postfix server. i was able to get it to send emails with help in this thread. i can telnet into it via localhost, but not via domain name.
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May 8, 2011
I am writing an script for sending emails with ssmtp email client in an appropriate form.I want to know how can I check mail server that I want to send mail to it if it exist and ready to receive email or if not log an error.
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Jul 9, 2010
I want to block a domain name in sendmail server. I added the domain name and "REJECT"in /etc/mail/access file. What has to be done for the changes to take effect? when i run make command in /etc/mail dir i get following error : make: Nothing to be done for `all'.
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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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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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Jun 9, 2010
How could we bcc all outgoing / incoming email through my Sendmail (8.14) Server?
I tried this /etc/procmailrc
:0c
! backupmail@domain.com
But this get looped and backupmail received multiple emails of each for domain.com while sending locally from one user to another user.
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Feb 11, 2011
I use sendmail as the MTA for our company. Lately employees have started working from home. These home users send their email through our company MTA using SASL-AUTH. This works fine for the most part but lately we've seen problems with this. The SORBS blacklist looks not only at the IP address of our company's MTA but also at the IP address of our employees home computers. (After all, the home computer IP address is revealed in the mail header.)
SORBS has been rejecting emails sent from our home users because their dynamic IP address is present in the email headers. This is true despite their email passing through our company MTA which is on a properly forward and reverse mapped static IP. The company MTA is not listed in SORBS but the mere presence of a dynamic IP somewhere in the mail header is causing outright rejection. This seems bizarre to me considering home workers sending through a company relay is a common and reasonable business practice.
Can sendmail offer a solution here? For example, to change headers to obscure the IP address of the MUA or make the email appear to have originated directly on the MTA? I don't want to mess with internet RFC but frankly I'm out of ideas for how to get the mail delivered.
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May 4, 2010
I am having many mails transferred through my Sendmail server,but I want to configure only authorised email address through our server.optimize my mail server's configuration.
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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 9, 2010
I have a server "test1" in domain [URL]. I installed sendmail on it. I have another mail server "mailsrv" installed in [URL] which is my primary mail server and contains all accounts and mailboxes. Now when I send email to [URL] from [URL] it sends successfully. But when I try to mail to user1@abc.com it tries to search user1 in [URL] but I want it to forward this mail to mailsrv.abc.com over SMTP port. Delivery will then be taken care by [URL]
My log shows following
Code:
Apr 9 18:37:06 test1 sendmail[7512]: o39Db6Hs007512: to=user1@abc.com, ctladdr=root (0/0), delay=00:00:00, xdelay=00:00:00, mailer=relay, pri=30047, relay=[127.0.0.1] [127.0.0.1], dsn=2.0.0, stat=Sent (o39Db6Il007513 Message accepted for delivery) It should not go to relay=[127.0.0.1], it should go to relay=[10.10.10.1]
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Dec 4, 2010
i have installed redhat 5.3 and install sendmail on it.it is working perfectly fine.my question is|:
(1) can i restrict the sender and receivers email in sendmail?eg. i want to do that i want to allow only particular email addresses to send and receive and all other will be discarded
(2) i made aliases for all user but it only receives received mail copy i want both sent and receive mail copy in aliases.
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Sep 11, 2010
I wish to setup an email server, using sendmail and DOVECOT on F13 With no modification of the DOVECOT config file ( fresh installation ), I can see that :
service dovecot restart
shows me :
service imap stop
service imap start
In the config file, I have :
protocols = imap pops imaps pop3s
and of course, I cannot connect as pop3
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Dec 16, 2010
I'm using Sendmail 8.13.8 on a CentOS 5.5 vServer (Virtuozzo). I'm using a loop in PHP to send a lot of HTML-mails via sendmail. Each mail is a mail with individual statistics for our users, so its not mass mailing, bcc is not an option. It all works fine, but when I take a closer look there is a problem heading our way with a high number of mails: For each mail sendmail opens up 43 files. Sometimes these open files get closed again very fast, sometimes not.
Here is an example using the PHP-script below, it sends 20 mails in a loop:
[root]# php test-mail.php
START: number of open files: 2113
END: number of open files: 2973
This is the worst case. The number of open files (lsof | wc -l) used to send the 20 mails is 860 => 43 open files per mail. Sometimes the files are closed very fast, so I get results like this, too:
[root]# php test-mail.php
START: number of open files: 2113
END: number of open files: 2242
This shows 129 (3 * 43) open files, so the open files for 17 send mails are already closed, for 3 mails the 129 files are still open. In the worst case and with lots of mails our server crashes, the numfile limit of 8192 in user_beancounters is reached (our ISP won't give us more than 8192). Sendmail DeliveryMode is background. Could it be that sendmail tries to send lots ob mails asynchronously and uses 43 open files for each?
I'm only depending on sendmail to deliver the mails, normally I wouldn't dare to touch the sendmail config (like 'if you don't know what you're doing, don't!'). It is not a problem of PHP. I verified this by sending mails via SMTP localhost to sendmail (opened 43 files per mail) and sending mails via SMTP to an ISP-relay (did not open any files per mail). This is the code for test-mail.php:
PHP Code:
<?php
$output = shell_exec('lsof | wc -l');
echo "START: number of open files: $output";
// HTML message
$msg = '<html><head><title>Test mail</title></head><body><p>Mailbody</p></body></html>';
// Set 'Content-type'-header
$header = 'MIME-Version: 1.0' . " ";
$header .= 'Content-type: text/html; charset=iso-8859-1' . " ";
for($i=0; $i<20; $i++) {
// send mail, this opens up 43 files for each
mail('you@yourdomain.com', 'Testmail '.$i, $msg, $header, '-f
[email]bounce@yourdomain.com[/email]'); }
$output = shell_exec('lsof | wc -l');
echo "END: number of open files: $output"; ?>
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Nov 27, 2009
I'm confused about the sendmail/ssl combination. so confused, i'm not even sure what i'm confused about :) I want to have email sent from our server to the rest of the world in a 'secure' manner. Just dl'ed and installed CentOS5.4: Linux rh5 2.6.18-164.el5xen #1 SMP Thu Sep 3 04:03:03 EDT 2009 x86_64 x86_64 x86_64 GNU/Linux the /etc/mail/sendmail.mc has the instructions
[Code]...
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Jun 26, 2011
I don't know what to do, I know how to block and delete pretty much every other type of abuse. I run a server with 500+ shared hosting clients and reseller clients and it was just blocked because of email spam. I can keep on top of all other abuse (people trying to do dos attacks etc) but the one thing I can't get my head around is email spamming. how to stop people spamming emails from my server?
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Oct 30, 2010
I run my own home server using OpenSuse 11.1, everything is setup using apache, php, etc etc, and it all works perfect, but now I need to use my own email server for the use of Dolphin social networking software, so that when someone registers, the email server sends out registration confirmation emails, so I set up postfix, yeah right!!!, even though I followed all instructions to set postfix as a closed relay, a test done at mxtoolbox site still said it was an open relay, but while I was trying to set up postfix, my access to the server slowed down, and my servers drive light was constantly active,,, so when I look at the mail queue, I saw 4000+ emails, all from japan, (hinen.net), so I promptly shut down postfix and use postsuper -d ALL in the command console to delete the queue, but no matter how I try, I couldn't configure postfix as a closed relay,,, so I uninstalled it and installed sendmail, and using webmin, I could use a spam list and block the domain, now, sendmail's test at mxtools show as a closed relay, I can't even send out a test email using smtp auth, but disabling auth, I can, but now my IP is blocked at spam cop, and spamhaus,,, gmail server say my IP is not authorized to send to their servers, but to use my ISP relay instead,,, but my ISP doesn't have a relay,,hence the need to run my own email server.
My home server uses double layer firewall, a hardware firewall between the internet and the server, and a software firewall on the server, and I only allow the ports I need, IE, 80 = http, 443 = https, 20/21 = ftp, 25 = smtp, 110 = pop3. and that's all, but any other internal access from my workstation to the server, using ssh, I only open the ports on the server firewall. If someone here has a great deal of knowledge on sendmail, and can set up a an M4 (linux.mc) config file for me, it would be much appreciated. What I would like my email server to do, is to only allow the sending of emails from inside it's own server system,, ie, when a php script sends an email to the server, then the email server would let it through, but anything else, outside the local network is ignored.
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Oct 29, 2010
I want allow a local domain (domain.com) to send email ONLY locally, and I don't allow domain.com to send email to remote email (externally) . How to configure exim to do this ?
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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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Jun 1, 2011
recently i was raised my question about external and internal emailing using one domain name.Now i have another question about restriction.I can able to set email account and permit only local and external
now my question this kind of setup external and internal one thing i've noticed is that using prinzz1@domain.com(local only) was able to receive email from outside.is it possible to block all outside email if the prinzz1@domain.com is local only?
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Nov 23, 2009
i have a problem regarding our email server. all the users can send email but they cant received mail. .when hitting send receive on outlook there were no error found. .i have already reboot the server and restarted the sendmail services but still same problem.
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Oct 1, 2009
I'm trying to configure our mail server to block email from a specific sender reaching a specific recipient. In other words, if one of our employees is getting harassed by a 'stalker', how would one go about blocking, at the MTA (Sendmail) level, a specific sender email address from reaching a particular users inbox? We do not want to capture the email - simply block it before it consumes server resources.The Sendmail server (MTA) is a front end to our Exchange server so no user accounts exist on the Linux server. We simply use it as a SPAM and Virus scanner then forward clean email to the Exchange server.
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Jul 5, 2011
how to unblock email with attachment .zip should be all attachment through to my email i have below message when people sent me email to my domain
Warning: This message has had one or more attachments removed
Warning: (the entire message).
Warning: Please read the "Apex-Attachment-Warning.txt" attachment(s) for more information.
This is a message from the MailScanner E-Mail Virus Protection Service The original e-mail message contained potentially dangerous content, which has been removed for your safety. The content is dangerous as it is often used to spread viruses or to gain personal or confidential information from you, such as passwords or credit card numbers.
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Jul 15, 2011
What I want to do is from a file having block like
<event>
8 3 0.2685416E-02
2 -1 0
21 -1 0
[code]...
The first line after the "<event>" is its process-id, so I would like to have at the end a summary of how many "event" block I have for each type, ie how many
6 1 0.2685416E-02
or how many
7 2 0.2685416E-02
etc etc
I do not know in advance how many different-kind of block I will have, so it has to be a bit smart to scan the file, and make an new "summary" info for each unique type I was using something like
awk '/<event>/,/</event>/{if ($3 -eq 0.2685416E-02 ) { print $1" "$2" "$3}}' file > out
and then
grep -c "$1" "$2" "$3" but with no success since my awk commands prints all lines of each block
Suppose, that in advance I do know the $3, ie the 0.2685416E-02 which is a kind of weight
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Nov 4, 2010
system is RedHat v4. I removed root: admin-name@domain from /etc/aliases then ran /usr/bin/newaliases.
The admin does not get the emails but now the email generated by the cronjobs is being sent to my-name@domain outlook email from "root@localhost.localddomain". No other changes were made. Where should I start looking for the definition of sent crontab email to my-name@domain?
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Nov 18, 2010
I am using Red Hat Enterprise Linux AS release 4 (Nahant Update 5)and i am using send mail also..The issue is:
i am able to send emails from all OS users but unable to send mail from root user.(I am receiving mails if i send mails from all users except root user)what could be the issue?
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