Solved

Email Server Setup

Posted on 2006-07-01
9
436 Views
Last Modified: 2008-03-03
I work as a Systems Administrator for a school. We have our own Mail Server that runs on Mdaemon. I have my network running on local IP (192.168.x.x). I have a cisco router that has a real ip and a local ip. My mail server is running on local IP. I have defined NAT (in fact PAT) rules to re-direct trafffic from router to mail server and vice versa. The problem is that some of the domains (like AOL) traces the source of the email and get my local IP as source IP thus deny or reject the email generated from our mail server.

I want to switch my mail server to a real IP. What is the best way to accomplish this? I do have available real IPs. My concerns are:

1. Security
2. Functionality
3. Simplicity of the solution

Will I have to make my mail server a multihome system (with two NICs, one facing the LAN and other facing the WAN)?

I will really appreciate your help. Thanks.
0
Comment
Question by:ikhanr
9 Comments
 
LVL 104

Expert Comment

by:Sembee
ID: 17023696
I doubt whether it is the local IP address that AOL is having a problem with.
If it was, then they would have a problem with 90%, if not more of the email servers on the internet.

Have you looked at the AOL postmaster web site? http://postmaster.aol.com/
That will have lots of information on why emails may be blocked.

Put your domain in to dnsreport.com and see if it flags any errors.
The most common which cause problems with AOL are SMTP banner not matching the DNS, reverse DNS not present and forward DNS incorrect or not present.

Simon.
0
 
LVL 31

Expert Comment

by:rid
ID: 17026059
Agree with the above. Even many large organisations use the NAT/PAT solution without problems. I suppose you could have your mail server in the "DMZ" (assuming your router has such an option), but I'd investigate the problem more in detail before changing the setup if I were in your situation.
/RID
0
 

Author Comment

by:ikhanr
ID: 17029292
Thanks guys. I will look into more details of the problem. Thanks for the guidline.
0
PeopleSoft Has Never Been Easier

PeopleSoft Adoption Made Smooth & Simple!

On-The-Job Training Is made Intuitive & Easy With WalkMe's On-Screen Guidance Tool.  Claim Your Free WalkMe Account Now

 
LVL 3

Expert Comment

by:R-Yanin
ID: 17029619
Look into adding an RVP DNS record to your public DNS records yahoo AOL Microsoft and some others are very stringent on their reverse DNS lookups and are a common grievance with e-mail sent to them. AOL is the most strictly enforced reverse lookup organization I am familiar with.
0
 

Author Comment

by:ikhanr
ID: 17029875
I have a weird kind of setup (actually I have inherited it from our school's previous systems administrator). We have a website that is hosted by a hosting company. I have some of the dns records defined on their dns server. Then we have our ISP taking care of our Internet access.

Where do you guys think I should start to look for a solution first?

0
 
LVL 31

Accepted Solution

by:
rid earned 500 total points
ID: 17029952
Your ISP. They give you your IP and should have the authoritative DNS entry for this IP, no? Make sure there is a proper MX record for your domain name pointing to your IP and that all other entrieas are OK. Of course, the www.domain.com should resolve to whatever IP your web hosting company uses. A lot of useful info can be had by trying out your domain name or IP on the www.dnsstuff.com website.
/RID
0

Featured Post

Revamp Your Training Process

Drastically shorten your training time with WalkMe's advanced online training solution that Guides your trainees to action.

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

Today, security is a big concern in an organization to prevent sensitive data leakage. In Outlook you can secure your Outlook items (emails, calendars, contacts and other stuff) using various techniques like by marking item as private, or you can pu…
Microsoft Outlook provides an easy way to recover permanently deleted items. When you empty the Deleted Items or simply deleted an Outlook data items using shift+Del key then it can be recovered using Registry Key settings.  Caution- Wrong Registry…
This Micro Tutorial demonstrates  how Internet marketers work with competitive analysis data, and a common task in data preparation is creating separate column for domains. You will then extract from a list of URLs.
With Secure Portal Encryption, the recipient is sent a link to their email address directing them to the email laundry delivery page. From there, the recipient will be required to enter a user name and password to enter the page. Once the recipient …

685 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question