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Hi fakie flip, I'm not going to give all the answers but you just might be a bit more elucidated.
1. SASL is used to do authentications, so if you want to use this type of auth you must use. In either case there is no problem in setting postfix to also use it.
2. SMTP authentication is nowadays a must have, so YES you SHOULD have SMTP authentication.
3. your INTERNET provider should also need authentication server your server in order to allow the relaying.
4. Maildir and MBox are just tow type of repositories for your mail messages, in my case I use an IMAP server (cyrus-imap) to store mail mail into a DB.
5. your favorite!
6. Fetchmail will retrieve the mail messages from the original server and drop them into your server, using fetchmail you can also rewrite the message recipient.
7. NONE!!
8. I can't really understand your question, but I think you're asking if you need to setup Postfix with the same email addresses you have on gmail,yahoo, etc... No you don't need to do this, as I said before you rewrite the destination address in Fetchmail, this way you can have 3 or 4 different external mail accounts delivering to 1 single internal account.
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