Exchange 2010 Server not sending emails

My exchange server won't send emails externally.  I can send them to other users in active directory and I can receive them, but they won't send out.  I have the following DNS Records:

Internal DNS Server:
www   Host (A)   65.254.250.109
mail   Mail Exchanger (MX)   10.1.10.50
owa   Mail Exchanger (MX)   10.1.10.50/OWA/


My external DNS from Network Solutions is:
www       7200       65.254.250.109
@ (None)       7200       76.116.24.242
* (All Others)       7200       65.254.250.109
mail.delranems.org       7200       76.116.24.242

And the External MX Mailserver DNS:
mail.delranems.org.(10)       7200



For my Organization Configuration -> Hub Transport -> Send Connectors, I have Default Send Connector Enabled.  My FQDN under the General tab is mail.delranems.org.  Address Space is Type = SMTP, Address = *, Cost = 1.  Network Tab = User domain name system (DNS) "MX" records to route mail automatically.  Source server, I have DES-DC1, Site is delranems.org/Configuratio..., Role = Mailbox, Client Access, Hub Transport.  

My firewall I have Port 25, 80, 443, 53 Open.



Any ideas why It isn't sending mail?
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cmb991Asked:
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Jerod SandersonCommented:
For your Organization Configuration -> Hub Transport ->Accepted Domains do you have delranems.org?
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Malli BoppeCommented:
In the exchange does your mail go through any spam filter or direct to the internt.
Do get any NDR.
Check the queues
The Send connector an Internet send connector
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MegaNuk3Commented:
Check on www.mxtoolbox.com and make sure you have a PTR / reverse DNS entry for your mail server
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cmb991Author Commented:
Accepted domains are delranems.org.

I do get an NDR saying that the email wasn't sent yet and the message will continue to try and deliver for 19hours... blah blah with the time.

I'm not sure where to check the queues....

Organization Configuration -> Hub Transport -> Send Connectors    I have Default Send Connector, and these Properties Settings:

Protocol logging level = None
FQDN = mail.delranems.org
Maximum Size = 10240

Address Space = Type=SMTP, Address=*, Cost=1          Scope send connector is not checked.

Network = Use Domain Name System (DNS) "MX" records to route mail automatically.                  Enable Domain Security is not checked.

Source Server = DES-DC1     Site = delranems.org/configuration....      Role = Mailbox, Client Access, Hub Transport


This is my PTR:
PTR      76.116.24.242      c-76-116-24-242.hsd1.nj.comcast.net      2 hrs
reverse lookup      smtp diag      port scan      blacklist

Reported by dns102.comcast.net on Monday, March 28, 2011 at 5:35:12 AM (GMT-5)

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cmb991Author Commented:
When I go to https://www.testexchangeconnectivity.com

When I do the outbound SMTP test, I get:

Checking Block List "SpamHaus Policy Block List (PBL)"
       The IP address was found on block list.
       
      Additional Details
       The IP address 76.116.24.242 was found on the block list.
Status code: 10



Checking Block List "SORBS Block List"
       The IP address was found on block list.
       
      Additional Details
       The IP address 76.116.24.242 was found on the block list.
Status code: 10




      Performing Sender ID validation.
       Sender ID validation was performed successfully.
       
      Test Steps
       
      Attempting to find the SPF record using a DNS TEXT record query.
       ExRCA wasn't able to find the SPF record.
       
      Additional Details
       No records were found.


 
I tried to send an email to an @yahoo.com account, @comcast.net account.  Neither of them were receiving them.
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cmb991Author Commented:
Wow, changing my send connect dns to smtp.comcast.net worked.  I guess I have to use comcast dns lookup?
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MegaNuk3Commented:
Best to contact your ISP and see if you "have to" use their server to send mail.

You are receiving mail so that would suggest port 25 is open. You must of been able to send at one point otherwise your IP would not be on a blacklist.

You need to remove yourself off the blacklist and sort out your PTR record if you want to send direct to the Internet via DNS
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Malli BoppeCommented:
As per below article can you make sure that intent of the conenctor is set to internet.
http://smtpport25.wordpress.com/2010/07/11/exchange-2010-connectors/
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cmb991Author Commented:
I will just use smtp.comcast.net.  I can't see it making a big difference weather I use smtp.comcast.net or my own... right?
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