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Sendmail is an MTA. That stands for message transport agent. As in to another MTA on another server. Evolution and kmail are MUA, as in mail user agent. You use them to read mail that has been receivec by an MTA.

I am having similar problems setting up postfix. I have an internal network--lets say foo.private--behind a nat router, and a *different* public address--let's say foo.net. I can send mail, but my server sends the internal nw name in the HELO handshake with the receiving mail server. This exposes my internal machine names and causes some receiving servers to flag mail from me as spam, as my internal name can not be resolved. Please provide a detailed description of your network setup and what you are trying to accomplish. Maybe we can work something out. cheers

My 2 cents: Go with Proftpd. It's plenty secure--it runs several of the main mandrake mirrors. The Proftpd config file is quite similar to Apache, which you will want to learn anyway. Get used to text config files. GUI is nice as long as everything works right, but when something goes south what do you do? How will you know what each GUI button does to the real config file? How will you fix your app? Push buttons and hope, ala windoze? You will find that many options on the GUI are named differently than the real options in the config files. If you take the time to read the (ample) documentation on the web for each server, you will learn how your system really works and you will produce cleaner config files that are more stable and easier to maintain. Unfortunately (or not), Linux is not meant to be easy. It's meant to be flexible, powerful and secure. Read. Learn. The rewards are many. cheers