To guarantee main conversion that is, to open an e-mailey etracking technology was utilized to show the relevance of the subject line. Usually, respondents centered their attention on the first three words of the subject line; see Figure 2. Later on, we examined whether the respondents understood the whole message subject as well as its pre-header (that is, dattracking the topic of the message). If the message subject consists of more than five words, respondents nearly never caught words in the pre- Header. According figure 2, most of the respondents read four words at most. Deeper study revealed that these are second and third rather than the first terms.// etc. These words can be seen as triggers of later behavior, which the respondents performed depending on the e-mail. Testing results let us pinpoint the region of interest where the respondents' scommunications fall. Its position has evolved now and is regarded as one of the most successful marketing initiatives engage...