Reply to post:

The last post: Building your own mail server, part 1

7layer

Yes I was referring to a home broadband with Dynamic address.

But even for example Virginmedia's IP does not work properly and they only change the IP 1-1.5 years.

Most providers got these address blocks already, not a big deal, can be checked on ripe.net freely.

Also not to mention all SPAM filter providers, they do know these blocks already.

If you have a domain to play with, try a fix public IP address with a "wrong" not matching reverse dns address without having an SPF record for the domain. All providers Google/Hotmail/Yahoo will reject your email and will end up in the spam folder, marked as spam. Maybe I was wrong about the reject part, it will end up in the SPAM folder, clearly the user wont have it as a legitimate email.

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