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Cannot reveive email

By Rabbit_Runner ·
Hi, I am helping a small organization. They have a small office, one Windows 2000 server (with AD) (SP2), and several workstations (Win98, Win2k Pro, Win XP, and Macintosh). Their internet connection is DSL with a static IP address. Their server is used for several things?. WWW, FTP, File Server, Print Server, and Mail Server. Their Mail program is Exchange 5.5 with SP4. Their email has been working just fine, until this past weekend. From that time, they can send messages, but they cannot receive any. From discussing things with the staff, and checking the configurations, there is no known changes (none that we know about). The FTP works fine, and their WWW pages can be accessed okay. All computers on their LAN can browse the network and get out to the internet.

I suspect something in the DNS settings on the server, but I am not positive. I did enable the DNS forwarders to a couple of DNS internet servers. External from their LAN, I can ping their IP address, ping their www.domain.org , ftp.domain.org , and mail.domain.org.
At this time, they cannot receive ANY email. They have other web email addresses and have been using them while I am trying to fix the problem.

I would appreciate any help. If more information is needed, let me know and I will try to supply what you may need. Thanks.

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Cannot reveive email

by curlergirl In reply to Cannot reveive email

This definitely sounds like a DNS problem from what you've said so far. That is, assuming you have done all the normal things like checking to make sure the Exchange Internet Mail connector is operating properly, and that things aren't being blocked at a firewall or router. One important question is - is their internal DNS server the authoritative server for their domain? If so, you need to check the DNS database to be sure that there is an MX record for the Exchange server - this is what allows the DNS server to know where smtp packets go. That is why I think it is, in fact, a DNS problem - since they can send mail but not receive it, it appears that whatever DNS server is authoritative for their domain has lost its MX record for their Exchange server's IP address. Since you enabled some DNS forwarders and that's when things stopped working, my guess is that your local DNS server is NOT authoritative for your domain and your ISP's DNS servers do not have MX records set up for your domain. You can find out by using nslookup - at the command prompt type: nslookup - [ISP's DNS Server address]. You should get a response from that server with it's name and IP address. Then at the next command prompt, type: set q=ANY and press enter. Then at the next command prompt, type your domain name. You will get back a response from the DNS server with all of the information it has for your domain. If you don't see any MX information, or if you see the wrong information, you need to contact them and get them to set it up correctly. I ran into this problem once with our ISP - they had installed some new DNS servers and the database wasn't replicated properly so the MX records for my domain simply disappeared and all of a sudden we couldn't send email - so it does happen! Hope this helps!

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Cannot reveive email

by Rabbit_Runner In reply to Cannot reveive email

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Cannot reveive email

by Rabbit_Runner In reply to Cannot reveive email

Here is the DNS information from the primary DNS Server.
C>nslookup - <IP_Address>
Default Server: ns3.dns_server.net
Address: <IP_Address>

> set q=ANY
> domain.org
Server: ns3.dns_server.net
Address: <ipaddress>

domain.orginternet address = <Static_IP_Address>
domain.org MX preference = 10, mail exchanger = mail.domain.org
domain.org nameserver = ns1.dns_server.net
domain.org nameserver = ns2.dns_server.net
domain.org nameserver = ns3.dns_server.net
domain.org
primary name server = ns1.dns_server.net
responsible mail addr = hostmaster.dns_server.net
serial = xxxxxxxxxx
refresh = 43200 (12 hours)
retry = 300 (5 mins)
expire= 360000 (4 days 4 hours)
default TTL = 3600 (1 hour)
domain.org nameserver = ns1.dns_server.net
domain.org nameserver = ns2.dns_server.net
domain.org nameserver = ns3.dns_server.net
mail.domain.org internet address = <Static_IP_Address>
ns1.dns_server.net internet address = <ipaddres#1>
ns2.dns_server.net internet address = <ipaddres#2>
ns3.dns_server.net internet address = <ipaddres#3>
>
===============================
It looks okay. The MX records are there and pointing to the Static IP of the Organization. Can you please advise on what or where to look next? This problem has really got us baffled.

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Cannot reveive email

by Rabbit_Runner In reply to Cannot reveive email

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