PLANET CS-2001 - Manual (Page 465)

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Training Schedule
 CS-2001 can be scheduled a daily time for spam or ham training.
 CS-2001 can be set to immediately train.
An Overview on Email Transmission
A mail server acts as an intermediary among users during mail delivery or
retrieval. The format of an email address looks like “[email protected]”.
Information on the left side of an “at” sign (@) indicates an account name while the
other side denotes the host name or domain name.
For instance, when sending an email from an email application, a DNS query
will be made to retrieve the MX record from the domain name. This will return a list
of host names of mail exchange servers. The email will be sent to the host name with
the highest preference number. If no MX records could be retrieved, the email will be
sent to the A record of the domain name. The account name will then be used to
send the email to the specified email account.