A method, the method comprising: receiving an electronic message from a sender of the electronic message by a classification scanner, wherein the electronic message is an outbound electronic message; determining, by the classification scanner, a classification type that applies to the electronic message, the classification type determined based on an express indication configured by the sender prior to sending the first electronic message to the recipient, wherein the classification type is used for ensuring that the electronic message complies with a compliance criteria associated with the classification type, wherein the classification scanner includes a plurality of scanners, each scanner configured to scan the electronic message to determine whether the sender has expressly indicated that a respective classification type associated with the respective scanner applies, and wherein the determining of the classification type comprises scanning the electronic message by the plurality of scanners; providing, by the classification scanner to a machine learning trainer, the electronic message and an identification of the classification type that applies to the electronic message, the machine learning trainer adapted to determine a machine learning policy that associates attributes of the electronic message with the classification type; receiving, by an enforcer from the machine learning trainer, the electronic message and the identification of the classification type that applies to the electronic message; applying, by the enforcer, the classification type to the electronic message according to the machine learning policy and, thereby, ensuring that the electronic message complies with the compliance criteria associated with the classification type; transmitting, by the enforcer, the classified electronic message to the recipient; receiving, by the classification scanner, a further electronic message, determining, by the classification scanner, that the further electronic message includes the express indication that the classification type applies to the further electronic message, wherein attributes of the further electronic message indicate that the machine learning policy associated with the classification type is to be applied, and sending, by the classification scanner, the further electronic message to an enforcer; applying, by the enforcer, the classification type to the further electronic message according to the machine learning policy and, thereby, ensuring that the further electronic message complies with the compliance criteria associated with the classification type; and transmitting, by the enforcer, the classified further electronic message to the recipient. receiving an electronic message from a sender of the electronic message by a classification scanner, wherein the electronic message is an outbound electronic message; determining, by the classification scanner, a classification type that applies to the electronic message, the classification type determined based on an express indication configured by the sender prior to sending the first electronic message to the recipient, wherein the classification type is used for ensuring that the electronic message complies with a compliance criteria associated with the classification type, wherein the classification scanner includes a plurality of scanners, each scanner configured to scan the electronic message to determine whether the sender has expressly indicated that a respective classification type associated with the respective scanner applies, and wherein the determining of the classification type comprises scanning the electronic message by the plurality of scanners; providing, by the classification scanner to a machine learning trainer, the electronic message and an identification of the classification type that applies to the electronic message, the machine learning trainer adapted to determine a machine learning policy that associates attributes of the electronic message with the classification type; receiving, by an enforcer from the machine learning trainer, the electronic message and the identification of the classification type that applies to the electronic message; applying, by the enforcer, the classification type to the electronic message according to the machine learning policy and, thereby, ensuring that the electronic message complies with the compliance criteria associated with the classification type; transmitting, by the enforcer, the classified electronic message to the recipient; receiving, by the classification scanner, a further electronic message, determining, by the classification scanner, that the further electronic message includes the express indication that the classification type applies to the further electronic message, wherein attributes of the further electronic message indicate that the machine learning policy associated with the classification type is to be applied, and sending, by the classification scanner, the further electronic message to an enforcer; applying, by the enforcer, the classification type to the further electronic message according to the machine learning policy and, thereby, ensuring that the further electronic message complies with the compliance criteria associated with the classification type; and transmitting, by the enforcer, the classified further electronic message to the recipient.