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From ClueWiki

ClueMail is Cluenet's email service. It provides many different configurable services to users who are signed up for it. Email addresses are USERNAME@cluenet.org.

Features include:

• IMAP Access (SSL/TLS/None)
• POP3 Access (SSL/TLS/None)
• SMTP Access (SSL/TLS/None)
• Flexible disk quota
• Server-side email filtering with maildrop
• Email filtering web interface via sqwebmail
• Three web-based clients: webmail (sqwebmail, squirrelmail and roundcube)
• A number of squirrelmail modules
• Unofficial webmail access via IMAP allowed
• Automatic spamassassin spam filtering
• Configurable dspam spam filtering

To get access to Cluemail, ask an admin about it. There is currently no automated method of gaining access (although this should change soon), so an admin will manually and subjectively determine if you should have access to it.

To configure your email client to work with Cluemail, point it at the IMAP/POP3 server mail.cluenet.org, and the SMTP server mail.cluenet.org. Both will require authentication of your Cluenet username and password. SSL or TLS is recommended for all transmissions. For the authentication method, select "Password" or "PLAIN". This is necessary to authenticate to LDAP, but is not a security risk if SSL or TLS are used. The CA certificate for all Cluemail SSL and TLS services is the global Cluenet one, available at the NOC.

All official webmail is linked from here. Squirrelmail is somewhat more flexible in what you can use it for, because it has a number of modules that are installed that you can use. However, sqwebmail is much faster, because it interfaces directly with the Maildirs on the system. Sqwebmail can also create server-side email filters. These filters apply to all messages and all email clients that you use, including other webmails. So, if you want to set email filters, use the sqwebmail interface. It's fairly intuitive.

Spam filtering is done by default with spamassassin. You'll notice that you have several mail folders by default relating to spam. The Spam folder is where all spam that is classified by spamassassin goes. Messages in this folder are automatically deleted after a period of time. There are two subfolders of Spam - "This is spam" and "This is not spam". If you get a false positive, move it to the "This is not spam" folder. After being marked as not spam and helping to train the spam filter, it will be automatically moved to your INBOX. If the spam filter misses spam, move it to your "This is spam" folder. Messages in this folder will be used to automatically train the spam filter, and then they will be deleted.

If spamassassin misses a lot of spam messages, you may want to try to use dspam. All of your messages are automatically run through dspam to begin with and tagged with headers. All you have to do is set up a filter to move all of the classified messages into a folder. In the sqwebmail filter interface, type in a name for the new rule (like "DSpam"), and select the bubble next to "Header". Then type "X-DSPAM-Result" in the box next to it. Over to the left, select "Starts With", and type in "Spam". In the next section, select "Save In", and select the folder you want to save the DSpam-classified spam into. Then click Submit. Make sure you also click "Save all Changes" at the top before leaving. Note that dspam may give a higher false positive rate at first, because it works entirely off of a probability network, as opposed to spamassassin, which uses specific rules and heuristics. DSpam will have to be trained before it will be very useful.