|In a nutshell|
|If I don't like you (rare) your mail will be rejected.
If you write to me with an alphabet I do not know, you are a spammer and will be rejected.
If you send me a mail all in HTML or with too many attachments containing Windows executables, you are likely a virus and will be rejected.
|If you send me a seminar or conference announcement, or are a system crontab,
I'll let you pass and file you somewhere (or reject while I'm away)
If you are sending via a mailing list I'm subscribed to, I'll let you pass (and eventualy file you somewhere or reject while away).
|If you are sending a spam-looking content, you'll pass but will be filed in a seldom checked folder, and eventually deleted in one week.|
|If I know you, or you are in a known academic domain, I'll let you pass. and read soon.|
|If you are in a commercial domain or look otherwise suspect, you'll pass but will be filed in not often read folder, and eventually deleted in one week.|
|Otherwise you will be quarantined but can authorize your mail to pass sending me a password (you will be notified in this case).|
Note that rejections are sent to different folders (all linked to /dev/null) so that log analysis can keep a statistics of the different reasons for rejection. This applies to the rejections done above or below.
In fact the user is not yet quarantine-free. At this moment I can read his messages, but I've not inserted him yet in the white lists. Until I do so, any further message from him will be subject to a new quarantine (with a new password).