SMTP 25 blocked externally

Posted by Jeff on Server Fault See other posts from Server Fault or by Jeff
Published on 2011-01-08T16:02:39Z Indexed on 2011/01/08 16:55 UTC
Read the original article Hit count: 168

Filed under:

windows-server-2008

|

networking

|

smtp

|

exchange-2007

|

emailserver

not sure how to title this question...

we run an exchange server with around 80 internal users, all outgoing mail is relayed off a smart host (ISP smtp server) so nothing is actually sent to the world via our server. i wanted to check the server, locally i can telnet to port 25 with no issues and receive the esmtp service ready reply. whenever i do it from an external address (off our local network) i receive unable to connect error 10060.

can this cause problems with SPF records, and reverse DNS ? should my exchange server be able to accept smtp requests, requiring authentication before i am able to send from external addresses? if so how...

also the exchange server is behind a NAT (asa) device, more than likely thinking that the nat is not configured to route the smtp 25 request to the exchange server..

thanks

© Server Fault or respective owner

Related posts about windows-server-2008

Password policy problem windows server 2008

as seen on Server Fault - Search for 'Server Fault'
Hi, I'm creating a domain and I need to make users that can have an empty password but administrators have to comply with password complexity how to I solve this problem? Thanks in advance >>> More
SAP DCOM Connector on Windows Server 2008

as seen on Stack Overflow - Search for 'Stack Overflow'
Does anybody know, if it is possible to use the "old" SAP DCOM Connector on a Windows Server 2008 ? I want to migrate a old ASP Web Solution with DCOM Connection to SAP from Windows 2000 Server to Windows 2008 Server. When I try to install the DCOM Connector I get the Error Message: "Setup could… >>> More
Windows Server 2008 R2: AD Module for Windows PowerShell

as seen on Internet.com - Search for 'Internet.com'
Windows Server 2008 R2 includes a new Active Directory module for Windows PowerShell, a consolidated group of 76 cmdlets that can perform a host of tasks against Active Directory's various services. >>> More
Windows Server 2008 Directory Services, Group Policy Preferences - More Control Panel Settings

as seen on Internet.com - Search for 'Internet.com'
In Windows Server 2008, Group Policy Preferences makes it possible to reap the chief benefits of an Active Directory environment by simplifying client management. Control Panel Settings nodes in the Group Policy Management Editor makes this possible. >>> More
Windows Server 2008 R2: Introducing the AD Administrative Center

as seen on Internet.com - Search for 'Internet.com'
The Active Directory Administrative Center in Windows Server 2008 R2 is a significant improvement over its predecessor. Although not without limitations, it offers beefed-up management of AD objects, new navigation capabilities, better task-based management options, and improvements to the properties… >>> More

Related posts about networking

Networking stopped working on Ubuntu

as seen on Super User - Search for 'Super User'
I installed Ubuntu 10.04 through the Wubi installer (Funny, I installed it today and thought I would have gotten 10.10). I had a network connection and everything was working fine. I rebooted my coumputer a couple of times and then suddenly, I could not connect to the network and when I click the… >>> More
Troubles with start up defenition of networking service in Ubuntu

as seen on Super User - Search for 'Super User'
I use Ubuntu 12.04.1. I put attention that networking script starting in runlevel 0: user@comp:/etc/rc0.d$ chkconfig -l networking networking 0:on 1:off 2:off 3:off 4:off 5:off 6:off When I try to move it working to appropriate run levels I get error: user@comp:/etc/rc0… >>> More
Installing the Elgg Social Networking CMS

as seen on Internet.com - Search for 'Internet.com'
One Open Source CMS that stands out above the rest for small businesses and personal networks is the Elgg open source "social engine," which can be used to create social applications. Scott Clark shows you how to install and get started with this social networking CMS. >>> More
OAuth: Token-Based Authorization for the Social Networking Age

as seen on Internet.com - Search for 'Internet.com'
The OAuth token-based authorization system allows users to grant third-party access to their resources without sharing their usernames and passwords. It's perfect for the age of data scattered across many social networking sites. >>> More
OAuth: Token-Based Authorization for the Social Networking Age

as seen on Internet.com - Search for 'Internet.com'
The OAuth token-based authorization system allows users to grant third-party access to their resources without sharing their usernames and passwords. It's perfect for the age of data scattered across many social networking sites. >>> More