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SBS 2008 not receiving emails, can send fine

Can telnet
no bouncebacks
run all tools all fine
anonymous enable in connector
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techies123
Asked:
techies123
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1 Solution
 
David AtkinTechnical DirectorCommented:
Run an smtp check from mxtoolbox.com and paste the results into here.

The normal cause of this is due to low server disk space.  Check that the Server has more than 5GB of free space.

If disk space is low then Exchange will stop processing inbound emails and put them into a queue file until more space is available.
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techies123Author Commented:
10Gb free
mx toolbox fails
server has been working fine till 4pm
telnet on 25 is fine from my remote computer
firewall is
 off
Have removed AV SW
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techies123Author Commented:
Connecting to 217.35.89.11
 1/15/2015 10:45:40 AM Connection attempt #1 - Unable to connect after 15 seconds. [15.02 sec]

MXTB-PWS3v2 15025ms
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techies123Author Commented:
4pm yesterday
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David AtkinTechnical DirectorCommented:
Check your router to see if it is still forwarding port 25 to your server correctly.

A port scan on that IP shows no open ports.  Restart the router / firewall and verify NAT settings
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techies123Author Commented:
Remote Server returned '< #4.0.0 smtp; 4.4.2 - Bad connection 'timeout' (delivery attempts: 0)>'


got bounce back at last

have rebooted router draytek. I can telnet ? how come if no open ports
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David AtkinTechnical DirectorCommented:
How are you doing the NAT on the Draytek?  Open ports or port redirection?

Personally I would take a backup of the Draytek, update the firmware and then reconfigure.

If you mail is working internally and you get an answer when telnetting on port 25 to the server then it does point to the router.
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techies123Author Commented:
PORT SCAN

Starting Nmap 6.00 ( http://nmap.org ) at 2015-01-15 19:29 EET
Initiating Ping Scan at 19:29
Scanning 217.35.89.11 [4 ports]
Completed Ping Scan at 19:29, 0.10s elapsed (1 total hosts)
Initiating SYN Stealth Scan at 19:29
Scanning mail.wrr-uk.com (217.35.89.11) [3 ports]
Completed SYN Stealth Scan at 19:29, 1.43s elapsed (3 total ports)

Nmap scan report for mail.wrr-uk.com (217.35.89.11)
Host is up (0.065s latency).

PORT STATE SERVICE
25/tcp filtered smtp
80/tcp filtered http
443/tcp filtered https


Nmap done: 1 IP address (1 host up) scanned in 1.74 seconds
 Raw packets sent: 10 (416B) | Rcvd: 1 (28B)
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techies123Author Commented:
yes tend to agree on Draytek it is an old one
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David AtkinTechnical DirectorCommented:
Have you got a spare router that you can try?
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techies123Author Commented:
quite a drive to site. firmware is latest for the 2600 but an old router all the same
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David AtkinTechnical DirectorCommented:
You could test port forwarding by opening a port to a client machine (something that isn't the server) and seeing if it works.  RDP to a client would be a good test.  If it fails then it points the finger at the Draytek still.

Check the servers event logs for errors with IIS and Exchange.  If there aren't any then I think a site visit to replace the router is in order.
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tmoore1962Commented:
Have you verified your domain Records and DNS settings on the server?   Verify that your public IP address is correct. Are your exchange certs self signed or 3rd party?   Verify your exchange certificates haven't expired.
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techies123Author Commented:
Cheers you got me on right track
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David AtkinTechnical DirectorCommented:
Was you on POP?  I see you added a mail server for KCOM?

Good find tmoore.
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techies123Author Commented:
No SMTP. I had removed the record to see if it was causing an issue, now back on cheers
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David AtkinTechnical DirectorCommented:
The main DNS record and IP has remained the same? Was the router at fault?
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