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Anti-spam--

Our philosophy: Missing a single important legitimate e-mail is much worse
than  manually processing a few spam messages per day.

We have spam classification disabled by default.


Enabling the spam classifier--
If spam starts to bother you and steals from your time go ahead and
enable the spam classifier. Here is how:

 - From the webmail main menu hover "Mail" - a drop-down menu opens
 - From the dropdown menu click on "Filters"
 - Click on Spam
 - Choose a "Spam Level" (5 is a good candidate) and select
   "Folder to receive spam" ( using the folder named "Spam" is recommended )
 - Click on "Save and enable"

Now you have spam classification enabled and all the mail classified as
spam will go to the selected folder.

You have to know that a spam classifiers can not be 100 % correct (yet).
Thus there are:

 - false negatives - underestimated spam messages classified as legitimate mail
 - false positives - legitimate messages classified as spam. These are the
   more dangerous ones, as if you are not careful they can lead to important
   legitimate mail being hidden from you.

There are two terms:
 - spam filtering - spam is not delivered to your mailbox at all. It can
   either be rejected or dropped.
 - spam classification - spam is delivered to a special folder in your
   mailbox.

Spam filtering--
We try to do as little spam filtering by default as possible.
Currently we only have these spam filters enabled:

 - Greeting delay:
   https://en.wikipedia.org/wiki/Anti-spam_techniques#Greeting_delay

 - Forward-confirmed referse DNS
   ( can be disabled for your domain per your request )
   https://en.wikipedia.org/wiki/Forward-confirmed_reverse_DNS

These two are only blocking spammers and misconfigured e-mail servers.
They have very low level of false-positives and legitimate
remote senders get notified immediately to take action and fix the
misconfiguration of their mailing system.


Spam classification--
Spam classification is optional. Each mailbox can enable or disable it
at any time.

The idea of the spam classifier is to sort your incoming mail for you.
It is not supposed to be 100% correct.


Training the spam classifier--
E-mail differs from mailbox to mailbox. Depending on their
connections and activities on the internet most users receive different
type of e-mail. Spam content also differs significantly between mailboxes.

When the spam classifier is enabled for a first time in a mailbox it starts
to apply common classification rules. Although carefully crafted they can
not work equally well for everybody.

Thus we provide each mailbox its own database of spam and not-spam (ham)
messages. The classifier consults this database when it decides whether
given message is spam or ham . The database can be manually updated
(trained). Manual training is needed when the classifier does not take
the correct decision and creates false positives or false negatives.

To train the classifier:

  - If you see legitimate e-mail in the Spam(Junk) folder move it to
    your inbox. The webmail has "Innocent" button which does that.
    In your desktop mail client you can usually use drag&drop.

  - If you see spam in your inbox move it to the Spam(Junk) folder.
    The webmail has "Spam" button which does that.
    In your desktop mail client you can usually use drag&drop.

Anti-spam tips--

 - Remember: Missing a single important legitimate e-mail is much worse
   than manually processing a few spam messages per day.

 - If you only get a few spam messages from time to time do not use
   the spam classifier. It is easier to only check your inbox.

When you have the spam classifier enabled:

 - Check the e-mails in your "Spam" folder regularly
 - When you see false postitives or false negatives manually train the
   classifier.

You can easily turn your spam classifier into a spam filter by choosing a
"delete" or "reject" action instead of delivering to a certain folder.
But don't.


More e-mail filtering/classification--
You can configure other e-mail filters/classifiers. To do so:

 - From the webmail main menu hover "Mail" - a drop-down menu opens.
 - From the dropdown menu click on "Filters".

There you have an interface for several common tasks:

 - Whitelist
 - Blacklist
 - Vacation
 - Forward
 - Spam

You can read more for each of them by clicking the question mark (help)
next to "Existing rules" or when you open one of them.

Note that the order in which the filters are defined is important.
You can reorder them by using drag&drop .

You can also create custom filters. E.g.:

  - to sort your incoming mail into certain folders
  - to delete (discard) some messages
  - to reject some messages ( that is discarding a message and returning
    a notification about this to the sender )
  - redirect, flag, notify, etc ..

Do not forget to consult the help page if you want to use some of these
but do not know what exactly does it do.

The filters are configured via the webmail but they are applied by the
mail delivery software and thus the rules defined there will be applied
to all the incoming mail. It does not matter if you access it via the
webmail or your desktop mail client.