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No incoming email direct to SBS 2003 Server

Hi There

I've recently taken on a client.   They were running an SBS 2003 Server with exchange, on a dynamic IP.  Emails coming through POPCon and going out through an SMTP connector.

They got hit with a SPAM attack, which I have cleared following the advice on here (thank you).  I have organised and configured a static IP address, which is operational, and canyouseeme.org reports the relevants ports open and services working.

Now that emails flow directly to the server, they are not coming through.  I can telnet locally (from the server) to port 25.  But not externally.  I know the service is operational, and the port is open.

I am looking for the next step please.  The ultimate goal is for the emails to flow through a hosted spam filter before arriving at the server.  But the service cannot be configured until emails are flowing properly.

Many thanks in advance for you help.

Alex
EE-N00b
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Alex-Nicol
Asked:
Alex-Nicol
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2 Solutions
 
Alan HardistyCo-OwnerCommented:
Re-Run the Connect To The Internet Wizard and change the method of delivery from POP3 collection to direct delivery.

Start> Server Management> To-Do List> Connect to the Internet.

Once mail is flowing, you can then restrict the SMTP Virtual Server to only receive from the IP Addresses of your 3rd Party spam filtering host.
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Alan HardistyCo-OwnerCommented:
To restrict access, please have a read of the following KB article:

http://support.microsoft.com/kb/823019

Specifically the "To Configure IP Address Restrictions" section.
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Alex-NicolAuthor Commented:
Hi Alan

Thanks for your help.  I've now done that and restarted the server, but still no email :(
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davorinCommented:
What does it say SMTP test at www.mxtoolbox.com for your domain?
Do you have some NDR of mails tried to be sent to that server?
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Alex-NicolAuthor Commented:
Good thinking Darvorin

mx:acsxxxxxx.org.uk

10 mail.acsxxxxxx.org.uk <correct IP> 3hrs

Running and SMTP Test I  get

You hung up on us after we connected. Please whitelist us

Reverse DNS FAILED! This is a problem..
Warning - Does not support TLS.
Server disconnected before banner was complete.
 
Session Transcript:
You hung up on us after we connected. Please whitelist us

Which reminds me of something I didnt undo after clearing the SPAM.....

I have now disabled all filtering I previously implemented.  However I cant say it was receiving emails before as they used to come in through POPCon.  SMTP Check still reports the above.
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davorinCommented:
So mails are still not coming in?
What does SMTP log say on your server? If there are no evidence of incoming connections maybe is a problem on your firewall/router.
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Simon Butler (Sembee)ConsultantCommented:
If you are on a dynamic IP address it might be that inbound SMTP traffic is blocked by the ISP.

Simon.
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Alan HardistyCo-OwnerCommented:
On the SMTP Virtual Server Properties, is the TCP Port specified as port 25?

General Tab> Advanced Button.

If not, please change it to port 25 and then restart the SMTP service.
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Alex-NicolAuthor Commented:
In reverse order:

Alan - TCP Port is set to 25

Sembee - It is a static IP address that is supplied by a "Business Telecoms Specialist"  I have emailed to ask the question, but I suspect that port 25 will be fine for incoming mail.

Davorin - Where are the logs please? and what specifically am I looking for?

Thanks for your continued support.

Alex
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davorinCommented:
You can enable SMTP logging and see the logs location under SMTP virtual server.
http://www.msexchange.org/tutorials/Logging_the_SMTP_Service.html
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Alan HardistyCo-OwnerCommented:
Can you telnet to your SBS server locally from a client PC?

telnet sbsservername 25

If you can - then at least locally all should be fine.

Is your firewall configured properly to forward TCP port 25 to your SBS server?
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Alex-NicolAuthor Commented:
Alan

Further to Davorin's question I went clicking through Menu's and found the CONNECTION one, which set to Only the list below:- and the list was blank.  Something that was part of a suggestion for clearing the spam problem. I changed this back to All except the list below.  And now the emails are flowing again.

However this has only been in place for 4 hours and I already had 7 separate queues of 10 emails each of postmaster emails to spurious addresses.

I'm assuming this is people trying to send through the server, or is it responses to more spam email?

Apologies for the frenetic nature of this post, I really don't want to spend 72 hours clearing 115,000 emails again! :)
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Alan HardistyCo-OwnerCommented:
Postmaster emails is generally a sign of spammers sending emails to invalid Recipients on your server and you not having Recipient Filtering enabled.

Please have a read of my article which shows you how to enable this:

http://www.experts-exchange.com/Software/Server_Software/Email_Servers/Exchange/A_2556-Why-are-my-outbound-queues-filling-up-with-mail-I-didn't-send.html
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