Depending upon the technique "optical in mail" of Internet marketing,the word,"optical in " became famous, but "optical out" are two meanings largely with the antonym.

One (entirely, or) discontinues the subscription of the optical in mail which is registered partly. The reader who subscribes the mail magazine plural among the interest fields which have been registered, for example, when the subscription register is removed with the notion that, there is no interest in the personal computer, "optical out it does", that you say. Secession from the mailing list and the mail magazine you call optical out.

One points to the thing "of consideration to convenience of subscription cancellation" of the optical in mail already. That the reader subscription can be discontinued freely with anytime, among other things clearly writing the method of subscription cancellation in end and the like of the mail hits to this. When method of subscription cancellation is troublesome, explanation and insufficiently is, beingalmost not to be different from , the mail marketing person in charge note is necessary.

If furthermore, in the world of privacy protection and consumer information protection etc., enterprise and the like private information permission of this person being necessary in advance when it offers to the collection utilization third party "optical in", the opportunity which it can utilize can restrict from after should have offered thing "optical out" calls.

You say at this standpoint, if the "optical out mail", the addressee does not work optical out (secession), those of the type which continues to send the mail are meant. If it is not denied, "(tacit) there was acceptance of reception", that it is the standpoint that you consider.

However, there is a case such that "this mail as for unnecessary that please inform", writing with the portable telephone mail, and the like does un-discriminating mass transmission, reply original mail address the user is, "address gathers and" because and so on uses, there is also criticism in standpoint of the "optical out mail".