Electronic Mail at CAL

Each user account in the CAL network will be given an IMAP mailbox, initially configured with 1GB of storage. The mailbox will be accessible via IMAP, but will require TLS for access. A webmail interface (secured via HTTPS) will also be provided. The mail will be filtered for spam and viral content before delivery.

Recommended Email Handling Software

• Thunderbird
• Evolution
• netscape7 (on sun network)
• Pine, Mutt (text based, will continue to be available)

IMAP, SMTP, and Webmail

Internet Message Access Protocol (IMAP), is a system by which your e-mail is kept on the server and can be accessed from any machine on the network. When you want to view, send or manage your messages, your e-mail program (client) connects to the CAL central e-mail server for access. Because your e-mail always remains on the server, you can easily retrieve it from virtually any location with Internet access. IMAP is useful if you travel frequently, access your e-mail at multiple locations, and/or use web mail as your main mail client.

Configuring outgoing mail using SMTP

Detailed information regarding the email server settings and related information can be found on the MUA Configuration page.

Using Web Mail

Web mail is an alternative to accessing your email via an email client. It can be used at any time but is particularly useful when travelling. Simply point your browser to ​https://mail.astro.columbia.edu and log in.

Managing Your Incoming Mail

Email Quotas

There is a 1GB storage limit for every CAL e-mail account. Your IMAP quota is visible from any IMAP client which supports the QUOTA capability (and most do). It can also be seen from the ​CAL webmail site. To view your quota in ​Thunderbird 1.5, for example, select the inbox of your CAL account in the "Folders" pane, and choose Edit|Folder Properties... from the menu. The Quota tab in the dialog box that appears shows your quota.

It is important to keep in mind that you have a limited amount of space on your CAL email account to store email. As mail addressed to your account comes in, it is placed in your Inbox mailbox, and it will stay there indefinitely, until you move it to your personal computer or delete it. When the total amount of email you have in your Inbox exceeds your account's Inbox allotment, new incoming email will be bounced. (Returned to its sender.) Each account has a reasonably large allotment, but if you get a a few -- or even one -- email messages with large attachments, your Inbox can fill up pretty quickly. You will receive a series of automated messages as the size of your Inbox approaches your Inbox quota.

Spam Filtering

CAL is running ​DSPAM to provide users with personalized spam filters that will adapt to your preferences. Mail messages determined by a user's filter to be spam will by default be routed into the user's spam subfolder (based on the X-DSPAM-* headers added by DSPAM).

If you find a non-spam message in your spam folder, you should tell the filter that it made a mistake. You can do that by simply forwarding the message to notspam-username@astro.columbia.edu (replace "username" with your CAL username, of course!)

Conversely, if you find a spam message in your inbox, you can retrain your filter by forwarding it to spam-username@astro.columbia.edu. If you conscientiously retrain your filter when it errs, it will be better able to anticipate your preferences in the future.

Personalized Filtering

Traditional UNIX-style .forward files are not used on the new CAL system. We're using ​sieve, an emerging standard for mail filtering. You can see an example sieve script here (this example script is installed by default for all CAL users, and can be found on Configured Workstations at /usr/share/doc/cal-base/examples/sieve/cal-default.script. It filters spam into the user's spam subfolder based on the X-DSPAM headers mentioned above).

If you want to write a new sieve script, simply put it in a text file on a Configured Workstation, and use sieveshell to import it to mail.astro.columbia.edu. For example, here is dkg importing a sieve script located at ~/newsieve.script:

[0 dkg@kalyke ~]$ sieveshell mail
connecting to mail
> put newsieve.script 
> activate newsieve        
> quit
[0 dkg@kalyke ~]$ 

You can find some ​example sieve scripts ​online, if you want to experiment more.