Cannot Recieve Outside Email

[Arsynic]

I'm running Exchange 2000 in conjunction with Symantec for MS Exchange and all of a sudden I can't recieve emails from outside. I can send them fine, but I can't recieve emails. Is there an inbound email queue that I can check? Is there a checklist that I can go through to solve this problem?

 

[Treyze]

Check your connection, telnet to your outside ip address to check if your Firewall is the issue. telnet (IP ADDRESS) 25

if you able to telnet, check you DNS by using nslookup. Set type=mx and look at your domain information. Your mx record should reflect your external address of your firewall.

 

[Arsynic]

Okay, I did a telnet and I was able to get in. However, when I did an nslookup, I got this message:

***Can't find server name for address [ip_address]: Non-existent doman
***Default servers are not available
Default Server: Unknown
Address: [ip_address]

I don't know how to do the mx thing, can you give me details on how to use it? When I typed "mx" it says:

Server: Unknown
Address: [ip address]

***Unkown can't find mx: Non-existent domain

 

[Arsynic]

I flushed the queue and had it send me the NDR messages and this is what I keep getting:

     name@domain.org on 6/23/2005 12:07 PM
            This message was rejected due to the current administrative policy by the destination server.  Please retry at a later time.  If that fails, contact your system administrator.
            <mydomain.com #4.3.2>

I think it has something to do with Symantec for MS Exchange because the email subject says:

"Undeliverable: Symantec Mail Security detected unscannable content in a message sent from your address (SYM:15847902344046122621)"

I just found out that we can't send or recieve. I turned off Symantec to see if that is the problem. This is really busting my brain. No changes were made besides adding new Email accounts. I did check the Event Viewer and I got one message about MSExchangeIS being out of licenses. I don't know if that stalls mail or not.

 

[N0ktar]

Did your domain name possibly expire?

 

[Arsynic]

How would I know if my domain name expired?

 

[Arsynic]

I rebooted the server and opened port 25 in the firewall. Now I'm getting mail.

 

[blakey2]

To throw my 2cents in:

If you opened port 25, in your firewall, did you open it for the explicit IP address of your mail server, or the *probable* default of all internal IP addresses?

I'd make sure that only your mail server is allowed to send SMTP traffic through port 25, otherwise you risk a possible SPAM blacklisting, if one of your client machines becomes compromised and is turned into a SPAM engine.

.... I have this friend you see and it may have happend to him *grin*...


Cheers.