Email marketing refers to a network marketing method that delivers valuable information to target users through emails under the premise of the user's prior permission. Email marketing has three basic elements: based on the user's permission, information is delivered via email, and information It is valuable to users. The lack of one of the three elements cannot be called effective email marketing.
According to the above definition, which of the following is effective email marketing?
Xiao Wang became a member of a certain brand product publication in 2002. One year after the membership period expired, Xiao Wang decided to withdraw from the membership, but he failed to withdraw from the membership online, and the product continued to send messages