the present embodiments deal , generally speaking , with protection against unauthorized dissemination of classified digital documents . in a preferred embodiment of the present invention , the method provides a utility that allows the leverage of current features to create classification of security requirements , to be utilized by components of the security system , in order to govern the routing of e - mail messages . in a preferred embodiment of the present invention the user uses a user interface in order to provide details regarding the required security handling policies with respect to the content of the mail he or she creates . these details may , for example , include limitation on distribution such as authorized recipients groups or security and confidentiality level . after these details are entered , the system enforces the indicated handling of outgoing mail by intercepting and blocking mails whose destination and sending method is not allowed according to those details . in a preferred embodiment of the present invention the system alerts authorized personnel and / or the sender and / or the original composer of the mail when blocking occurs . in another preferred embodiment of the present invention , the mail is not blocked for certain security handling policies and only the alerting occurs . in another preferred embodiment of the present invention , for certain security handling policies , the blocked mails can be sent by authorized users in order to override the blocking action in a preferred embodiment of the present invention the user interface is integrated into the mailing software by implementing an extension to the mailing software . in another preferred embodiment of the present invention the user interface is integrated into the mailing software by intrinsic support within the mailing software . in another preferred embodiment of the present invention the user interface is integrated into the mailing software by an external utility . in another preferred embodiment of the present invention the user interface is integrated into the mailing software by a combination of an external utility and an extension of the mailing software and / or intrinsic support within the mailing software . in a preferred embodiment of the present invention , the mailing software is microsoft &# 39 ; s outlook ™. in a preferred embodiment of the present invention outlook ™ is extended by implementing a com ( microsoft &# 39 ; s component object model ) object preferably implemented as a dynamic link library — dll , which utilizes outlook &# 39 ; s add - in support com interfaces . this is referred to as an outlook add - in . in another preferred embodiment of the present invention , the mailing software is microsoft &# 39 ; s outlook express ™. in a preferred embodiment of the present invention , an existing interface is extended as part of the user interface support ( for example the sensitivity drop - down box in microsoft &# 39 ; s outlook ™). in a preferred embodiment of the present invention , a property sheet is added to the options interface as part of the user interface support . in another preferred embodiment of the present invention , a command bar button is added as part of the user interface support . in another preferred embodiment of the present invention , some of the events ( for example composing a new mail , or sending mail ) are handled as part of the user interface support ( e . g . causing a window to pop up ). in another preferred embodiment of the present invention windows in which user interaction is possible are parts of the user interface support . in a preferred embodiment of the present invention activex controls ( a specialized kind of com objects conforming to a specified interface ) are utilized as part of the user interface support . in a preferred embodiment of the present invention an external utility handles events in the mailing software and implements part of the user interface support . in a preferred embodiment of the present invention , part of the user interface support in microsoft outlook ™ include utilizing the categories and / or sensitivity and / or importance fields in order to reduce ( or eliminate ) the need to implement an extension . e . g . a distribution groups can be indicated by some of the categories selected and sensitivity can indicate the confidentiality level classification . in a preferred embodiment of the present invention , part of the user interface support in microsoft outlook ™ includes extending and / or changing the sensitivity and / or importance fields &# 39 ; underling enumerated type ranges . in a preferred embodiment of the present invention , part of the user interface support in microsoft outlook ™ includes utilizing the mileage and / or the billing information and / or the companies . in a preferred embodiment of the present invention , part of the user interface support in microsoft outlook ™ includes utilizing the user properties fields that provides support for adding named property fields . in a preferred embodiment of the present invention some of the information is embedded in mail headers and / or attachments before explaining at least one embodiment of the invention in detail , it is to be understood that the invention is not limited in its application to the details of construction and the arrangement of the components set forth in the following description or illustrated in the drawings . the invention is applicable to other embodiments or of being practiced or carried out in various ways . also , it is to be understood that the phraseology and terminology employed herein is for the purpose of description and should not be regarded as limiting . reference is firstly made to fig1 which is a simplified illustration showing a conceptual view of a system that allows for content segregation and classification of confidential content , constructed and operative according to a preferred embodiment of the present invention . a mail client 110 is equipped with a mail client add - in 112 . the mail client add - in 112 provides the user with an interface , which facilitates classifying authored mail - messages and the like . a classification tag is embedded in the outgoing mail ; thereby facilitating its classification , after its interception by the mail server security add - in 122 , while it is destination and sending method via the mail server 120 to outside network 130 . if the classification tag indicates that the intended recipients are authorized , the mail server destination and sending methods it to its intended recipients , otherwise it is blocked . the classification may indicate other handling methods such as alerting , asking an authorized user to authorize the routing of the mail to the as yet unauthorized recipients , etc . in another preferred embodiment of the present invention , the enforcement module comprises at least one of the following : a mail server add - in operable to interface a mail server and to enforce the security requirements on the mail server &# 39 ; s mail traffic ; and a mail security server operable to intercept mail messages from a mail server and enforce the security requirements on the mail server &# 39 ; s mail traffic . in another preferred embodiment of the present invention , the information dissemination system comprises software , and the system for classification and enforcement of security requirements is implemented by at least one of the following : at least one com object utilizing an add - in interface in the dissemination software ; extending the meaning of at least one existing data storage field ; extending the meaning of at least one existing data field in a protocol ; extending the meaning of at least one existing data entry entry field adding a further user interface to be supported by handling at least one event in the dissemination software ; adding a further user interface to be supported by at least one additional property sheet ; adding a further user interface to be supported by at least one additional command bar ; adding a further user interface to be supported by at least one additional command bar button ; adding a further user interface to be supported by at least one com object ; adding a further user interface to be supported by at least one activex control ; adding a further user interface to be supported by at least one com object utilizing an add - in interface in the dissemination software ; adding a further user interface to be supported by at least one outlook ™ plug - in ; adding a further user interface to be supported by implementing at least one extension to the mailing software ; adding a further user interface to be supported by intrinsic support within the mailing software ; and adding a further user interface to be supported by at least one external software utility . reference is now made to fig2 which is a simplified illustration showing a conceptual illustration of a system , substantially similar to the system described in fig1 constructed and operative in accordance with a further preferred embodiment of the present invention . parts that are the same as in previous figures are given the same reference numerals and are not described again except to the extent necessary for an understanding of the present figure . in the embodiment of fig2 the classification of the mail messages is not embedded in the messages themselves . instead , classification information , as well as identifying data , are registered in a data storage 124 associated with the mail server security add - in 122 . reference is now made to fig3 which is a simplified illustration showing a conceptual illustration of a system which is substantially similar to the system described in fig1 constructed and operative in accordance with a preferred embodiment of the present invention . parts that are the same as in previous figures are given the same reference numerals and are not described again except to the extent necessary for an understanding of the present figure . in the system of fig3 a mail security server 126 is charged with the interception and classification of outgoing mail and handling of the mail accordingly . reference is now made to fig4 which is a simplified illustration showing a conceptual illustration of a system , substantially similar to the system described in fig3 constructed and operative in accordance with a preferred embodiment of the present invention . parts that are the same as in previous figures are given the same reference numerals and are not described again except to the extent necessary for an understanding of the present figure . in the system of fig4 classification information as well as identifying data are registered in a data storage unit 124 associated with the mail security server 126 , which is charged with the interception and classification of outgoing mail , and handling of the mail accordingly . reference is now made to fig5 which is a simplified flowchart illustrating workflow of a method of restricting mail distribution in accordance with a preferred embodiment of the present invention . first of all , a mail message input 510 is obtained , typically through user generation . the input is registered 520 and security restrictions 530 are set . afterward , when the message is distributed 540 , the legitimacy of the intended destination and sending method and recipients are validated 550 . if the message is approved it is then sent 560 . otherwise it is blocked 570 , and possibly an alert is issued . in another preferred embodiment of the present invention , the security requirements comprise requirements about at least one of the following : for example , a user with a secret security classification may not be allowed to send top secret classified information to external recipients , or may only be allowed to send secret classified information when encrypted or to a restricted set of recipients . in another preferred embodiment of the present invention , the security requirements are stored in at least one of the following ways : in another preferred embodiment of the present invention , the information comprises at least one e - mail message , and the security requirements are embedded in at least one of the following : in another preferred embodiment of the present invention , enforcement is carried out using at least one of the following : requiring authorization by an authorized party for the sending of the information ; in another preferred embodiment of the present invention , the information dissemination system comprises microsoft outlook ™ and the system for classification and enforcement of security requirements is implemented by utilizing at least one of the following fields : the default values of these fields may be changed , or interperted in a way which would encourage the user to utilize these field , for example , by changing the normal workflow for these values ( e . g . by displaying a message box , or blocking the sending of the information for some or all recipients ). in a preferred embodiment of the present invention the user uses a user interface in order to provide details regarding the required security handling policies of the mail she or he creates . these details may include , for example , limitations on distribution such as to authorized recipients or groups thereof or confidentiality level classification . after these details are entered , the system enforces the indicated handling of outgoing mail by intercepting and blocking mails whose destination and sending method is not allowed according to those details . the system may also alert authorized personnel and / or the sender and / or the original composer of the mail when a block occurs . in another preferred embodiment of the present invention , according to certain security handling policies , the mail is not actually blocked , but only the alerting occurs . in another preferred embodiment of the present invention , for certain security handling policies , the blocked mails can be resent by authorized users in order to override the block , thereby allowing recovery from system errors . in a preferred embodiment of the present invention the user interface is integrated into the mailing software by implementing an extension to the mailing software , by intrinsic support within the mailing software , by an external utility or by combination of the above . in a preferred embodiment of the present invention , the mailing software is microsoft &# 39 ; s outlook ™. in a preferred embodiment of the present invention microsoft outlook ™ mailing software is extended by implementing a com ( microsoft &# 39 ; s component object model ) object , preferably implemented as a dynamic link library — dll , which utilizes outlook &# 39 ; s add - in support com interfaces . this is referred to as an outlook add - in . in another preferred embodiment of the present invention , the mailing software is microsoft &# 39 ; s outlook express ™. in a preferred embodiment of the present invention , an existing interface is extended as part of the user interface support , for example the sensitivity drop - down box in microsoft &# 39 ; s outlook ™. in a preferred embodiment of the present invention , a property sheet is added to the options interface as part of the user interface support . adding such a property sheet enables the additon of data entry fields to the user interface . in another preferred embodiment of the present invention , a command bar button is added as part of the user interface support . in another preferred embodiment of the present invention , some of the events ( e . g ., composing a new mail or sending mail ) are handled as part of the user interface support ( e . g . causing a window to pop up ). in another preferred embodiment of the present invention , windows in which user interaction is possible are parts of the user interface support . in a preferred embodiment of the present invention , activex controls ( i . e ., a specialized kind of com objects conforming to a specified interface ) are utilized as part of the user interface support . in a preferred embodiment of the present invention , an external utility handles events in the mailing software and implements part of the user interface support . in a preferred embodiment of the present invention , part of the user interface support in microsoft outlook ™ include utilizing the categories and / or sensitivity and / or importance fields in order to reduce or eliminate the need to implement an extension . e . g ., a distribution groups can be indicated by some of the categories selected and sensitivity can indicate the confidentiality level classification . in a preferred embodiment of the present invention , part of the user interface support in microsoft outlook ™ includes extending and / or changing the sensitivity and / or importance fields and / or other enumerated type ranges . in a preferred embodiment of the present invention , part of the user interface support in microsoft outlook ™ includes utilizing the mileage and / or the billing information and / or the companies and / or the user properties fields . in a preferred embodiment of the present invention , part of the user interface support in microsoft outlook ™ includes utilizing the ability to add named fields in microsoft outlook ™ in order to provide classification labels . in a preferred embodiment of the present invention some of the classification information is embedded in mail headers and / or attachments ( note that in the case of microsoft &# 39 ; s outlook ™, some of the aforementioned fields are automatically included as headers ). in a preferred embodiment of the present invention the mailing software is ibm &# 39 ; s lotus domino server or lotus notes ™, and the information is embedded into the access control data . in another preferred embodiment of the present invention the mailing software is ibm &# 39 ; s lotus domino server or lotus notes ™ and the information is transferred separately from the sent note . in another preferred embodiment of the present invention the mailing software is ibm &# 39 ; s lotus domino server or lotus notes ™ and the information is attached to the note as a part thereof . it is appreciated that one or more steps of any of the methods described herein may be implemented in a different order than that shown , while not departing from the spirit and scope of the invention . while the methods and apparatus disclosed herein may or may not have been described with reference to specific hardware or software , the methods and apparatus have been described in a manner sufficient to enable persons of ordinary skill in the art to readily adapt commercially available hardware and software as may be needed to reduce any of the embodiments of the present invention to practice without undue experimentation and using conventional techniques . a number of features have been shown in various combinations in the above embodiments . the skilled person will appreciate that the above combinations are not exhaustive , and all reasonable combinations of the above features are hereby included in the present disclosure . while the present invention has been described with reference to a few specific embodiments , the description is intended to be illustrative of the invention as a whole and is not to be construed as limiting the invention to the embodiments shown . it is appreciated that various modifications may occur to those skilled in the art that , while not specifically shown herein , are nevertheless within the true spirit and scope of the invention .