The first place you want to start is by running an open relay test on your mail server. Google for "open relay test" and from any of the top listed sites, give the IP address of your mail server and it will test the server for open relay. Once you find the holes - some may not be too obvious, you can proceed to submit your IP for removal from the RBL list. This often takes from 24 - 48hrs. In the meantime, please ask your ISP to allow your mail-server to relay through their SMTP server. This should get your emails going until RBL listings are removed. I recently had an experience where the Nigeria 419 folks (i looked up the IPs that used the server for relay) took advantage of the test accounts we had created. Since the SMTP server was accepting SMTP-Auth, the test account as is the norm in most cases has a simple password. After many attempts they managed to get crack the password. Within a very short time, i had over 4 unique IP's registered to different providers (in different states in Nigeria according to AfriNIC whois) all using the server to send out 419's. Therefore, if you pass the open relay tests, its will be a high time to look at your logs and figure out how they managed to get your MTA to relay for them. HTH. Michuki. Brian Mang'oli wrote:
The company mail server is down i cant send mails.. i was told to check on the rbl list and it wrote that we were blaclisted ..Please advice Thanks
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