Mail me if you can

I finally found some time to configure my exim SMTP server. As I mentioned before I wanted secure connections to the Server. For that reaseon I told my Debian apt-get install exim-tls. This packege has (as you of course have guessed by it's name) TLS support compiled in. I still havn't unserstood where exactly the difference between SSL and TLS is; both are always mentioned together and sometimes even used as synonym (in Mail.app for instance where you can check the "Use SSL" Box for SMTP servers, but it does TLS). Both methodes (SSL and TLS) reliy on a Public Key Infrastructure (PKI) with the common CA model, the same thing you need when you use https.
OpenSSL is, as I mentioned in another posting, relatively complex, to say the least. I already have a certificate for the IMAP server, but I cannot use this one, because is has a diffent fomat - grr.
When you use the Debian tool for configuring exim (eximconfig Who would have guessed that?) and you got the exim-tls package installed it offers you to create a certificate for you, wich is a Good Thing^TM - but for some reason the certificate is only valid 30 days, which is just a little bit to short for my tase.
Well, it seems I need to fiddle a little bit with OpenSSL before I can really use the server in daily buissenss.
Another problem if you want to setup a mailserver, which sends mail for each of your mail adresses, because all of those freaky little freemail providers an even my university mail server do not offer encrypted mail transfer (which is a real problem if you are in a lot of untrusted networks) is relaying. Normal people (even with static IPv4 adresses - Want IPv6. Want it now) are considered as possivble spammers by a lot of ISPs. Well you cannot really blame them, but with more than 60% (!) of al email communication being spam one could argue that it doesent really matter and that the real time blacklists and dial-up list etc. don't stop any spamer who really wants to spam, but makes a lot of internet peer a kind of second class internt peers. The problem is that most people don't care - as usual.
There are a lot of good exim tuturials and mailsever tuturials around the net - the ones which helped me most are:
http://www.debianhowto.de/howtos/de/exim3/index.html and http://sites.inka.de/~gaetano/exim4.html

So much for today - stay tuned I'll talk a little bit more about the exim configuration in the next couple of days and post the final configurations in a little howto when everything is done.