You will also find very useful information here, so please read also this page.
1. Spam filtering
DTC, if setup normaly, will use amavis + clamav + spamassassin. When a mail is detected as a virus by clamav, it's simply sent in /var/lib/clamav and will never reach your mailbox. But if it's detected as spam by spamassassin, it will only be marked as spam in it's subject and header.
Then, if you wish, you can check "Enable SPAM filtering:". In that case, spam will be sent to a specific IMAP folder by courier-maildrop. By default, this folder is called "SPAM". Of course, you wont be able to receive the spams sent to this box using pop3. If you use an IMAP client, you will normaly see this folder. If you use squirrelmail, to see this folder, you have to click on "Folders", then at the bottom, subscribe for this SPAM imap folder, otherwise it wont show in the folder list on the left frame.
When using cyrus the mail will still be delivered to the inbox, but marked as SPAM. This will be changed in a future release where a sieve script will be generated when creating the mailbox. You can however create a sieve script manually.
2. Redirections - Courier only
DTC allows you to use redirections (which could also be called "forwards"). In case you receive a mail, it's also forwared to the email you enter in the redirections fields. The target email can be local on the server, or remote on another mail server. Note that it can be problematic to use forward in a remote mail server if that mail server has strict anti-spam features (like SPF, sender ID or others). Don't use it with AOL or MSN for example.
3. Deliver localy checkbox - Courier only
This checkbox sets if you want that receive messages are saved to your POP/IMAP account folder when receive by the mail server. It's nice to uncheck the option if you use a redirection to another mailbox.
4. Bounce message - Courier only
When you are away from your desk, you can check this option. This will send a bounce (or vacation) message ONCE (and only once) to each people sending you mail until you uncheck it. Use it when you go in holiday and can't check your mail for a long time for example.
5. Quota
If you wish, you can set a Quota for the mailbox. In a Cyrus installation the mail will not be bounced back immediately, it will remain in the mailqueue for a while to give the user a chance to clean up the mailbox.
If you do not wish a quota, set the quota to 0 if using Cyrus. Under Courier, this does not work, and email redirection doesn't work either with quota set to zero. You have to set a BIG quota value. With courier, don't forget to set the max number of files too.
6. Used Quota - Cyrus only
This show the used Quota (in Kb), max Quota available (in Kb) and how many percent have been used. This Quota is read live from cyrus, these are not outdated values that are read from the database.
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