Server deny the message, using smtp_message_class

I'm using smtp_message_class in a Linux server. All test messages where send, but Yahoo! and Hotmail denny receive the message. Gmail and my host in Brazil received the messenge without problem.

I saw in message header in my webmail "Received: from unknown (IP)". I guess this is why the servers denny. Someone can told me why this is happening?

I setup From, Reply-To, Return-Path and Errors-To headers. I'm missing something?

Sorry for the bad english!

It seems your SMTP server lacks of reverse DNS entry. If you tell me what is the IP you are using, I can check if that is the problem.

The IP is 209.200.226.93.

Thanks Manuel!

It seems the problem is that IP reverse record points to the domain ds00326.lunarpages.com, but that domain does not point to the IP. You need to contact the owner of that network to fix the problem.

dnsstuff.com/tools/ptr.ch?ip=209.20 ...

Thanks a lot for fast reply.

Just one more thing, for some reason the class are puting 3D before all "=". Example: <link href=3D"../../css/principal.css" rel=3D"stylesheet" type=3D"text/css"= />

That is quoted-printable escaping. It is necessary to escape 8 bit characters. Since = is used to escape all characters, it must also be escaped.