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Setting up SMTP connectors & DNS MX records

Posted on 2009-07-14
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Last Modified: 2013-11-30
I am currently transitioning a small business over to a new provider.

However, the ISP is stating if I connect to their SMTP server more than 100 times a day I will get blacklisted. They stated to use DNS on the SMTP connector.

If my DNS MX record points to their SMTP server will I still be connecting to them?

I do not want to get blacklisted, they will shut the domain down for 1 hour with no work around.
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Question by:dubeaukb
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by:Alan Hardisty
Alan Hardisty earned 125 total points
ID: 24854622
Your ISP is advising you to send out your mail via DNS to the world, rather than to use a Smart Host (their SMTP server) to send mail.
If you current default SMTP connector is setup to use a Smart Host - change it to use DNS and they should not cut you off.
Click on Start, Programs, Microsoft Exchange, System Manager.  Expand Connectors, the right-click on the Default Small Business Server Connector and choose properties.
On the General Tab, is the Connector set to use DNS to route mail or to Forward all mail through a Smart Host.
If the latter, change it to DNS, if using DNS then don't worry.
Do you have other SMTP Connectors?  Check those and make sure they are set to use DNS.
Your MX records only affect inbound email and should not have a bearing on this issue, unless you are connecting to your ISP's server to collect mail via POP3.  If this is the case, please let me know and I will give your further advice.
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Author Comment

by:dubeaukb
ID: 24854642
I am connecting to my ISP to pull the messages via POP3 connectors.

I have verified all my SMTP connectors are using DNS. However all my outbound test messages are stuck in queue, stating "SMTP could not connect to any DNS Servers".
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Author Comment

by:dubeaukb
ID: 24854653
So my MX record should reflect my local server?
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Alan Hardisty earned 125 total points
ID: 24854678
Okay - you mention that you are transitioning an SBS server over to a new provider - what is the current situation and what is the future situation?
If you are pulling mail from your ISP, the default minimum time for SBS 2003 is every 15 minutes.  That's 4 times an hour, 24 hours a day, makes 96 times a day, so you are under the 100 limit for connecting to your ISP.
If you are using the default SBS POP3 connector, then you are fine.  If you are using a 3rd party POP3 connector to pull mail quicker than every 15 minutes, you will get into trouble.
Your MX records directs mail to whoever you want it directed to, but whoever it points to, needs to be able to filter the messages for Spam (97% of all emails are deemed to be spam at present), so if you don't have the facilities in place to deal with spam on your SBS box, then leave it pointing at your ISP, or change the MX record to point mail to your server, install some Anti-Spam software or a hardware Spam solution and then your mail should come through with some spam, but hopefully not much.
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Author Comment

by:dubeaukb
ID: 24854723
The current situtation is they had mulitple services be hosted by multiple providers, ie domain hosting, webhosting, email hosting, ISP, basically everything came from a different company.

I proposed the solution of just using this ISP (One Communications) to provide a single solution for all their needs.

I am currently cutting over the email. I can receive just fine, however since I changed my SMTP connectors to use DNS I cannot send, my message are stuck in queue.

I have verfied my NS records.
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Assisted Solution

by:Alan Hardisty
Alan Hardisty earned 125 total points
ID: 24854744
Okay - let's check DNS forwarders.
Click on Start, Programs, Administrative Tools, DNS.
Expand DNS then select your Server (click on it).
Right-click on the server and click on the Forwarders tab.  Do you have any forwarder IP Addresses listed here?
If yes - are these the IP addresses for the DNS servers of their ISP?  If not - please work out what they are (call your ISP if necessary) and add them in.
Once added, click on the Monitoring Tab.  Select both check boxes for testing and then click on test now.
In the white area below, you should see PASS   PASS appear.  If you don't then something is not working properly.
What results do you get?
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Author Comment

by:dubeaukb
ID: 24854754
Second,
I am going through the current software on their server. They have Symantec Mail Security for Exchange. Does this suffice as an Anti-Spam solution? However I cannot connect  to the console do to lack of logon credentials.
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Expert Comment

by:Alan Hardisty
ID: 24854767
Yes it does.
You can reset the password.  Just looking for the link to show you how.
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Author Comment

by:dubeaukb
ID: 24854779
Simple Passed the Recurrsive Failed
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LVL 76

Expert Comment

by:Alan Hardisty
ID: 24854788
Okay - so DNS is not setup / working properly.
Do you have the forwarders setup?
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Author Comment

by:dubeaukb
ID: 24854801
Yes,
The forwarders are the two NS's provided by the ISP.

God this server is a cluster, the internal ip range is 192.10.X.X HA!
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LVL 76

Expert Comment

by:Alan Hardisty
ID: 24854813
Is the firewall setup to allow DNS out?
Can you run (from a DOS Prompt)
nslookup www.microsoft.com
what results do you get?
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Author Comment

by:dubeaukb
ID: 24854835
Okay,
I am at Pass Pass.
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Author Comment

by:dubeaukb
ID: 24854843
yes the firewall is wide open right now because I am about to transition to the T1 once the email is 100%
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LVL 76

Expert Comment

by:Alan Hardisty
ID: 24854906
What did you change to make DNS work?
Is your mail flowing now?
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Author Comment

by:dubeaukb
ID: 24854930
I updated the name servers. Removed the the DNS entries in the Virtual Connector. restarted IIS.

Now the remove server is not responding the connection attempts.

possibly as ISP issue?
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Expert Comment

by:Alan Hardisty
ID: 24854934
Could have sworn there was a password reset utility - cannot find any details.
I can call symantec tomorrow - I am a Symantec Reseller.
What version of Mail Security do you have?
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Expert Comment

by:Alan Hardisty
ID: 24854946
Sorry - not with you.
Which removed server is not responding?  Your ISP's mail server is not receiving your mail?
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Author Comment

by:dubeaukb
ID: 24854986
The symatec version is 6.0

I think I am unable to connect to the DNS servers because I am still on the old ISP static IP (DSL).

My new IP is static from my T1 provider.

I will have to leave you because I am going to take the network done to reconfigure the router to the new IP.

I will return and give credit on the responces you have given me.

Thank you for you assitance.
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LVL 76

Expert Comment

by:Alan Hardisty
ID: 24854991
No problems - good luck.  Come back if you need more assistance.
Alan
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Author Comment

by:dubeaukb
ID: 24859504
failed miserabl on the T1 conversion. Man I batting zero of late.
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Author Closing Comment

by:dubeaukb
ID: 31603507
Thanks Alan. I actually understand DNS and Exchange better now.
Thank you for your assistance. Unfortunately, I failed trying to transistion to my new T1 interface. I will have to open a seperate question.
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