I have searched the forums before posting. I do not feel previous posts answered by question regarding reverse DNS lookups on an ADSL line, for SMTP purposes.
Ubuntu, postfix etc,etc. Im fiddling with SpamAssassin, mail storage, user accounting and various tricks and tools, go through the logs and see how it executed. As I can fiddle to much then just restore VMware state. I prefer to have this test server on a local network. I am not keen to hemorrhage money to a upstream provider just for fiddling and testing purposes.
As many of you know, smtp from an adsl line will always be rejected, from "DOMAIN NOT FOUND" to "SENDER REJECTED" to "I DONT FEEL LIKE ROUTING YOUR MESSAGE TODAY". The DSL ip will be rejected and reverse dns will faulter.
How does one overcome this? Im not keen on using ClearOS's dyndns feature supplied by clear solutions. This will work but not the solution if you setup a scratch postfix box.