Login or Register to Ask a Question and Join Our Community

Sponsored Content
Full Discussion: External SMTP server
Operating Systems Linux Red Hat External SMTP server Post 302937203 by Duffs22 on Wednesday 4th of March 2015 07:31:53 AM
Old 03-04-2015
External SMTP server
Hi,

We current use an email/hosted exchange server (provided by 3rd party company).

Our production DNS (RH5) server has got the MX rec configured for this 3rd party mail relay server. So in order to resolve hostnames to send outbound mails an A record entry is also required on the external DNS server based on individual servers public IP adddress (in order to relay mails outbound).

The following concern has been raised re security:
- Having public addresses on a public DNS; servers are advertised publically therefore security risk.

In my opinion the production servers are located in the DMZ and so no internet facing IP can traverse onto the LAN without hitting the DMZ.

With the outbound connection configured on the external fw to only allow certain IP address to connect to a certain destination address - so this should remove any risk, as no one would see it.

Question: Would it be better practice to create our own SMTP server and have one public IP address presented to the external DNS server or is this an unnecessary overkill?

...interested in your thoughts/opinions on this.

Regards,
D.
 

10 More Discussions You Might Find Interesting

1. Solaris

SMTP server-denied

im running Solaris9. sendmail version 8.13 every now and then my smtp server is being blacklisted resulting to relay denied to some of my client. what is the very first thing i have to implement? thanks (1 Reply)
Discussion started by: uwagon
1 Replies

2. AIX

AIX 6.1 SMTP Server ?

Hello, Looking for Document how to install / configure SMTP Server on AIX 6.1 is it through smitty menu ? (3 Replies)
Discussion started by: filosophizer
3 Replies

3. Shell Programming and Scripting

Send email from sendmail on AIX using exchange server as SMTP server

i am new in AIX i am trying to write a script to take a backup for specific files on server to and check error log if backup success send email to administrator , script done except for sending mail , i try to configure sendmail on aix to use our exchange server to send emails but still get error... (0 Replies)
Discussion started by: ahmed_salah
0 Replies

4. UNIX for Dummies Questions & Answers

Can't configure sendmail to send mails to external SMTP Server

Hi all,I know, that this is very common issue, but I can't find where is the problem... I have Solaris 10 installed.I want to send mail to external SMTP server, like:echo "letter body"| mailx -s "subject" test@test.comBut I donno what kind of changes I have to do in /etc/hosts and sendmail.cf or... (5 Replies)
Discussion started by: nypreH
5 Replies

5. AIX

SMTP Server errors

Hey everyone, I have an issue where email is working fine in our Windows environments but is blowing up in our AIX environments. Here is the related functions that are getting called: int get_smtp_line( void ) { char ch = '.'; char in_data ; char * index; int retval = 0; ... (4 Replies)
Discussion started by: ctote
4 Replies

6. UNIX and Linux Applications

SMTP Server - dump email

Background: I am replicating a set of servers into a "bubble" for testing. Those systems cannot be aware they are in a "bubble" so I must replicate all external services. I have successfully replicated most of those services except SMTP. I would like to configure an SMTP server that collects... (0 Replies)
Discussion started by: NFN_NLN
0 Replies

7. Shell Programming and Scripting

php code - Sending mail with external SMTP server

Here is the code: <?php //new function function loadini($path) { $fp = fopen($path, "r"); $fpcontents = fread($fp, filesize($path)); fclose($fp); return $fpcontents; } $to = "test@test.com"; $nameto = "notme"; $from = "test"; $namefrom = "Who From"; ... (0 Replies)
Discussion started by: galford
0 Replies

8. Ubuntu

Any way we can create an SMTP server and use any scripting language to read emails from that server

Is there any way to create an SMTP mail server will all granular permissions to it so that I can read emails which that server receives through any scripting language and also reply from the same server automatically? (3 Replies)
Discussion started by: sandeepcm
3 Replies

9. UNIX for Dummies Questions & Answers

Postfix as smtp server

hi guys I have to configure a SMTP server using Postfix, ok let me tell the domain is located at godaddy so my smtp postfix server has to use that domain let's say mycompany.com so anyone knows how to configure postfix using this way? or postfix is easy to configure? thanks a lot (3 Replies)
Discussion started by: karlochacon
3 Replies

10. Web Development

SMTP Server Configuration

Hello list, I want to be able to send email directly from my linux box. I have both a CentOS and Debian installation. I am by no means an expert when it comes to all of the SMTP servers. I have been testing different configs by installing and uninstalling sendmail, postfix, and exim4. ... (2 Replies)
Discussion started by: landossa
2 Replies

LEARN ABOUT DEBIAN

calibre-smtp

CALIBRE-SMTP(1) 						      calibre							   CALIBRE-SMTP(1)

NAME

       calibre-smtp - part of calibre

SYNOPSIS

       calibre-smtp  [options] [from to text]

DESCRIPTION

       Send  mail using the SMTP protocol. calibre-smtp has two modes of operation. In the compose mode you specify from to and text and these are
       used to build and send an email message. In the filter mode, calibre-smtp reads a complete email message from STDIN and sends it.

       text is the body of the email message.  If text is not specified, a complete email message is read from STDIN.  from is the  email  address
       of the sender and to is the email address of the recipient. When a complete email is read from STDIN, from and to are only used in the SMTP
       negotiation, the message headers are not modified.

       Whenever you pass arguments to calibre-smtp that have spaces in them, enclose the arguments in quotation marks.

OPTIONS

       --version
	      show program's version number and exit

       -h, --help
	      show this help message and exit

       -l, --localhost
	      Host name of localhost. Used when connecting to SMTP server.

       -o, --outbox
	      Path to maildir folder to store failed email messages in.

       -f, --fork
	      Fork and deliver message in background. If you use this option, you should also use --outbox to handle delivery failures.

       -t, --timeout
	      Timeout for connection

       -v, --verbose
	      Be more verbose

   COMPOSE MAIL
       Options to compose an email. Ignored if text is not specified

       -a, --attachment
	      File to attach to the email

       -s, --subject
	      Subject of the email

   SMTP RELAY
       Options to use an SMTP relay server to send mail. calibre will try to send the email directly unless --relay is specified.

       -r, --relay
	      An SMTP relay server to use to send mail.

       --port Port to connect to on relay server. Default is to use 465 if encryption method is SSL and 25 otherwise.

       -u, --username
	      Username for relay

       -p, --password
	      Password for relay

       -e, --encryption-method
	      Encryption method to use when connecting to relay. Choices are TLS, SSL and NONE. Default is TLS. WARNING: Choosing NONE	is  highly
	      insecure

SEE ALSO

       The User Manual is available at http://manual.calibre-ebook.com

       Created by Kovid Goyal <kovid@kovidgoyal.net>

calibre-smtp (calibre 0.8.51)					   January 2013 						   CALIBRE-SMTP(1)
All times are GMT -4. The time now is 05:14 PM.
Unix & Linux Forums Content Copyright 1993-2022. All Rights Reserved.
Privacy Policy