Server :: Smtp Proxy Filter To External Isp Smtp?

Jan 31, 2010

In order to have greater control over the emails sent out the company I imagined the following scenario.ScenarioDescribing in words what I need.ser sends an email to for example, using the smtp of my isp (is the internet).Before the email is sent, the firewall checks if the recipient is blocked transparent, if you are locked out rejects the email.I searched several forums and mailing lists, but did not find scenarios similar to mine.Where found situations in which the mail servers were internally in the company, which is not my case.

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Networking :: Local Smtp Server And Smtp Server Of Domain Registrar Simultaniosly?

Nov 27, 2008

I have a domain name registered in, they provide email service also, can i use local mail server and registrar's smtp server at same time?

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Ubuntu Security :: Add Smtp Authentication To Postfix Installation Used As Spam Filter For Exhange Server

Feb 26, 2010

I followed this How To ( in order to add smtp authentication to my Postfix installation used as spam filter for my exhange server, and it'seem all ok; the only thing that I don't understand is where I list all the users (with passwords) that I authorize to send mail through my server...

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CentOS 5 :: Set Mailx To Use External Smtp Server?

Jan 14, 2011

In Red hat i used the nail command to send mail using an external smtp server without sendmail or other mail services active. My question is: In Centos 5 nail is not present but is present mailx in version 8.1.1-44.2.2

Is there a way to set mailx to use external smtp server ? because in many forum i get the string mailx -S smtp= etc.etc. but in my case the -S parameter generate mailx: invalid option -- S antoher question is there a an official repository to download rpm nail for centos ?

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Ubuntu Security :: Iptables How To Filter SMTP W/o S/MIME

Jul 10, 2011

Does anyone know the iptables statement that will block inbound SMTP messages that are NOT S/MIME encrypted?

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Networking :: CentOS Mail Setup - Sendmail Via External SMTP Server

Jul 30, 2011

I am setting up a CentOS box as a NAT firewall that needs to also send mail. It needs to send this mail using an outside provider's SMTP. The provider requires SMTP over SSL. None of the machines inside the NAT will ever send mail except via the provider's SMTP nor will they ever receive mail except to local clients via the provider's IMAP servers.

So for the example the machine is TESTMACHINE. There is one internet facing ethernet port connected to a DSL modem via pppoe.

The SMTP it needs to send mail via is which requires SMTP over SSL (port 465) and username/password authentication.

The sendmail documentation is quite confusing on how to get this simple setup operating, so an example showing the appropriate changes to and other require config files.

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Server :: Forward Root Mail To External Account Requiring Smtp Authentication?

Nov 3, 2010

I have one Centos Server and I want to forward root mail to 1 external account: [URL] I installed sendmail and created /root/.forward with this content: [URL] and I sent a test mail with this command: /usr/sbin/sendmail root <prueba.txt But nothing was forwarded.

After that I ran the same command with the verbose option:

/usr/sbin/sendmail -v root <prueba.txt

And this is the output:

root... Connecting to [] via relay...

220 localhost.localdomain ESMTP Sendmail 8.13.8/8.13.8; Wed, 3 Nov 2010 21:09:39 -0600
>>> EHLO localhost.localdomain
250-localhost.localdomain Hello myfriend [], pleased to meet you


For some reason sendmail tried to connect to smtp server and couldn't reach it. I am sure this is because the smtp server for domain is not is Besides requires authentication, username , password and the smtp port is not the default 25 is 9999. configure sendmail to forward root mail to a smtp server that requires authentication, username, password with a not the default 25 port?

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Server :: External SMTP Server With PHP / Send An Email Using An External Server?

Feb 9, 2011

I'm rather (VERY) inexperienced when it comes to Linux, but Fedora 14 is the environment I have to use on my laptop at work, so please forgive any dumb that comes out of me.

How do I tell php to send an email with mail() using an external mail server?

The situation: I've got apache/php running a webserver on my local machine. It's for dev purposes only, and the website files I'm using are checked out from our SVN. This lets me make changes to our website while not actually changing our website.

I've come across an issue I'm fixing where I need to verify that an email is successfully getting sent out, and unfortunately, this email is sent out using php's mail(), and not our website's usual $mail object. Unfortunately, I don't have the authority to change how this sends out right now, just when it sends out.

I've been running everything fine on my machine for a month now, and haven't needed the mail stuff until now. How do I tell php to send an email using an external server?

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Server :: Configuring Postfix With External SMTP Server?

Apr 10, 2010

I'm trying to configure Postfix with a mail server that I programmed in C. The is set in this way :

relayhost = [myMailServer.localhost]
smtp_sasl_auth_enable = no
smtp_use_tls = no
smtp_never_send_ehlo = yes

I don't know why it doesn't receive response after HELO. In fact if I debug my mail server with gdb, I can see it sends a 250 response code. Moreover, I've tested my server both with traditional mail clients, as Thunderbird, and through telnet session and it works very well.

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Software :: Make A SMTP Proxy?

Nov 12, 2010

I need to make an SMTP proxy. And I would like collect the communities thoughts on this.

Have you done this? If so: *What Linux flavor did you use? *What application? *Is there a how to?

I will be using SLES for the build. This will more than likely look like: Mail_server==>SMTP_proxy==>Firewall==>Internet==>Domain_mail_server

Well I am off to hit the

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Red Hat :: Use Sendmail As Smtp Server Instead Of Isp Smtp Server?

Apr 6, 2011

is that my isp's smtp service is very poorso i want to configure my own smtp servr for my internal clients only for sending emails not receivingi have static ip on my router with 25 port forward i have configure sendmail on linux its working fine on local network mean its sending email on local domainnow i want to send emails on other external domains with my public ipMean user of should be able to send emails on all internet domains like, etc

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Software :: SMTP Proxy - Split All Incoming Emails And Send Them To Two Different Servers

Apr 21, 2011

I'm looking for a smtp solution that will split all incoming emails and send them to two different servers.

On mail server 1 I have
Om mail server 2 (different location than mail server 1) I also have

MX-record for should point to mail server 3. Of course there will be a mail server 4 that will do the same as mail server 3. Mail server 3 will receive all incoming mails and forward them to both mail server 1 and 2. This will be a simple and cheap but bullet proof redundancy solution. I'm interested in this solution, have already looked into clusters, backup mx, imap-sync and a ton more of solutions but this is the solution we want. ny one who can point me in the right direction? I've been searching for weeks, the solution exist but I can't find out how to set it up. Not all mail should be forwarded this way, only one, not or

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Fedora Servers :: Set Up An External SMTP Relay Box?

Jun 29, 2011

I've tried googling this, and am having trouble finding something that doesn't end up being dizzying or confusing.

I was wondering if anybody could provide me with a concise, conclusive answer/guide.

I have a set of servers which require redundant SMTP relay. The first two of their SMTP relays are their own SMTP servers, and as such, are not dependable in the event that their network/servers go down. Their monitoring software runs on their machines as well, and uses the SMTP servers they themselves host.

I need to set up an external SMTP relay box that they can use to relay their monitoring alerts/admin notices in the case that their mailservers go down.

I have a company exchange server with pop/imap support @ my disposal but, unfortunately, that box runs Windows and does not permit any changes to services or additional software to add for the purposes of relaying clients.

So now, I need to create a dedicated linux box that can act as a relay to send email coming from the monitoring/admin/alert software in case their first two smtp servers have gone down.

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Software :: SMTP SSL In Chrooted Webroot - Warning: "fsockopen() [function.fsockopen]: SSL: Success In /var/www/krai/class.smtp.php"

Mar 29, 2010

Code: Warning: fsockopen() [function.fsockopen]: SSL: Success in /var/www/krai/class.smtp.php on line 105

Warning: fsockopen() [function.fsockopen]: Failed to enable crypto in /var/www/krai/class.smtp.php on line 105

Warning: fsockopen() [function.fsockopen]: unable to connect to ssl:// (Unknown error) in /var/www/krai/class.smtp.php on line 105

Those 3 errors popups when i chroot my webroot dir, without chrooting it works fine and email is send.

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Server :: Is TLS For SMTP Working

Apr 5, 2010

How can I verify if TLS is working for SMTP? I can see when I connect to Dovecot via IMAP4, a TLS session is present but I don't know to configure TLS for SMTP (sending messages).

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OpenSUSE :: Use SMTP Server With Thunderbird?

Mar 10, 2011

I was wondering that if its possible to send mail using my own localhost mail server, I guess I made the settings using yast2. I am not sure that I did right setup. And if I did setup my mail server correctly.

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General :: Run An Authenticated SMTP Server?

Aug 11, 2011

What is the simplest way I can get a secure, authenticated SMTP server running on my Linux machine so my family can use it to send mail from hostile networks?

Currently I have exim bound to 127.1:25 so if I can send mail from my laptop using ssh -L2525:localhost:25 But I'd like exim (or some other SMTP server) to bind to, eg, and accept authenticated SMTP connections.

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Ubuntu :: Can't Connect To Smtp Server

Jul 24, 2010

I have been using evolution to send/receive email from my account with 123-reg with no problems. My home ISP is aol. I am currently on vacation in France and using as my ISP. I can still receive email from 123-reg but when I try to send, get the error message "Could not connect to No route to host" 123-reg help seem to be either clueless or not bothered. I've tried altering settings in evolution preferences, but nothing seems to work. Currently set to "server requires authentication"

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Server :: Server Configuration For Small Office Server, Which Smtp, Pop Imap Server And Backup?

Apr 2, 2010

I have installed a linux server in my office to run 16 machines. Its main use will be a internal mail server but will be also running websites.

I have installed Ubuntu 9.10 server x64 and have got apache running.

I am looking for the simplest more robust solution for smtp, pop3 and imap. I have only ever used qmail before and found it a pain to configure and its getting old so I though I should probably try something new. I have not much experience with running pop3 or imap on linux so would love a suggestion on that.

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Software :: Mail.rc For External SMTP / Mail.rc Is Working Correctly?

Jul 1, 2010

I am running CentOS 5.5 and am trying to get Nagios to send out Emails.

After a bit of reading I have the following in my /etc/mail.rc file:

[root@linux ~]# cat /etc/mail.rc
set ask askcc append dot save crt
ignore Received Message-Id Resent-Message-Id Status Mail-From Return-Path Via
set smtp=
You have new mail in /var/spool/mail/root
[root@linux ~]#

I have Nagios setup correctly and introduced an error to generate an Email but nothing has come through.I suppose I have two questions:

1. Is mail.rc setup correctly?
2. Can I test to see if mail.rc is working correctly?

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Ubuntu :: Postfix To Trust Only One SMTP Server?

Jun 9, 2011

I have postfix relaying email to the internet for my LAN I need to configure postfix to trust only one SMTP server to relay his emails to the internet

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Server :: 8-bit-mime Apparently Not Being Advertised By SMTP?

Jan 5, 2010

I have a user that is reporting the following error on a bounced message:


smtp;554 5.6.1 Body type not supported by Remote Host

He is forwarding emails from his exchange server to a recipient in Germany relaying through our smtp server using Surgemail as the MTA.

He called a senior tech specialist at Microsoft to get help thinking the problem was on his end (exchange server). According to this "specialist", he said the problem was that our smtp server was not advertising 8BitMIME in its 250 statement. I tested this myself by log in on to the smtp server and doing typing the following:

EHLO localhost
250-smtp.<mycompanyname>.com. Hello localhost (


As you can see, 250-8BITMIME is not listed here. From the bit of research I made, I found that most MTAs send this by default. Is it possible that the characters from the German language are causing this problem?

NOTE: This problem did not exist or was never reported until now. No one has made any changes on any settings on the server.

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Server :: Exim With SMTP PLAIN Authentication *WITH* TLS

Apr 14, 2010

CentOS: 5.4
Exim: 4.63

I want to setup Exim to only allow sending mail from the localhost and externally with Plain authentication. I know I should use TLS but not all software supports TLS, I want Exim to use its own userpass file not the local system. I have spent a few days trying to get this setup, so far I have followed this: [URL].... But unsure what to change to remove the need for TLS.


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Server :: Postfix As SMTP Relay To Exchange Help

Jul 27, 2009

I have a linux box on my DMZ with postfix on it. I have exchange on our internal LAN on

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Server :: Postfix - Sending SMTP Mail ?

Oct 27, 2010

I have the following config with Postfix:


But it keeps coming up with:


Is there any reason from these configs as to why this should be occuring?

This was the guided step by step tutorial I followed: [url]

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Run DMZ Postifx Smtp - Relay Each Domain To Different Server?

Jan 19, 2010

I want to run a DMZ postifx smtp relay that will collect and relay several domains, this I can do. But is it possible to then relay each domain to a different server?If so how ? and what set up is needed.

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Server :: Sendmail SMTP AUTH Errors?

Aug 3, 2011

I am a bit of a linux newbie, but have been gradually teaching myself how to set up Sendmail 8.13.8 on a CentOS system to handle our MX mail for various domains we own on our local server. Configuration has gone well so far, except I cannot seem to get Outlook to authenticate with the SMTP server and I must readily admit to some large gaps in my knowledge. For testing purposes, I have tried to authenticate using Telnet with the following results:

220 ESMTP Sendmail 8.13.8/8.13.8; Wed, 3 Aug 2011 14:27:00 GMT
ehlo Hello [], pleased to meet you


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Software :: Free Smtp Server With No Restrictions?

Feb 16, 2011

I'm trying to configure notifying 'sys admins' cellulars about some events in clients IT infrastructure. In linux env it would be ease, just to use 'mail' cmd but need solution for windows env in this case.

I have RAID Controller running under windows xp and its raid array sotfware has feature to notify about events by email. I found some free solutions on the internet but most of them are shareware and if are freeware, they have limitations e.g. nr of sent emails per day.

Is there some free smtp server that I can use with no limitations?

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Red Hat :: Allow 100 Incoming Connections To Server Running Smtp?

Feb 24, 2010

I want to allow 100 incoming connections to my linux server running smtp. I know that tcpserver -c will set the limit of allowed incoming connections, but how can I tell what the currently set limit is?

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CentOS 5 Server :: Steps To Configure SMTP?

Sep 2, 2009

Can anyone help me regarding SMTP configuration? I can able to configure and i can send mail from my domain to other domains but cant receive from outside domain

My question is what are the steps to configure SMTP...suppose i wanna configure SMTP server and my hostname is so please mention the steps

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