Mmmmhh then the only other thing I can think of is that awhile back I think Len mentioned that some providers may give you a static IP address out of a dynamic block. IF that dynamic block is being blocked by your recipients mail server then you will see exactly what is happening.
Technically, that should be "some providers may give you a static IP address without a vanity reverse DNS entry", in which case you are 100% RFC-compliant, but to the uneducated you may appear to have a dialup connection.
That's why blacklisting E-mail on a single criterion, without any way to override it, it such a poor idea. Not everybody has the time to monitor every single E-mail sent by their server, see which one(s) are rejected, analyze the log files to see what they may need to change, change all sorts of minor details hoping that a minor change doesn't block mail at one small provider in order to get mail to another small provider, and contacting the providers that still don't accept your mail.
Over the past month, one of our customers decided to phase over from IMail to a Unix-based mail solution. Shortly thereafter, all their mail from our mailing lists bounced, because they fell for the tactic of blocking on a single criterion (they were removed from the lists). Then, they E-mailed asking to be added back to the lists, explained why the E-mail was bouncing, and said they fixed the problem. They were sent an E-mail back explaining what happened and what to do to get back online. The E-mail bounced. We re-sent it through our Internet provider's mailservers, as the people who like bouncing mail from IPs without a vanity reverse DNS entry seem to like mail relayed through an Internet provider's mailservers. That mail bounced. After all that effort to support someone who was no longer covered by a Service Agreement, we were getting tired of all this hand-holding. Another week later, they came back, saying that they fixed the problem (again!), and asking for us to re-subscribe them and let them know if mail started bouncing again. Needless to say, we don't have the time to hand-hold everyone like that.
What we have found is that a very few people do block E-mail that seems to be coming from dynamic IPs but is really coming from static IPs. They tend to be the really small Internet providers, and small businesses. The majority are using systems that do not block on a single criterion, and more reliable tests to determine whether or not an IP is dynamic (like the now defunct EASYNET-DYNA, that listed dynamic IP ranges, but would allow mailservers to easily be removed if they were actually in a static IP range). So most people don't really need to worry about this -- the rare few people who still thinks your E-mail is illegitimate because you have can't have a vanity reverse DNS entry, well, they don't want your mail, so it is probably going to be too much work to get it to them.
-Scott
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