Antonio , Great. Large databases of emails and email blasts always worry us. The first question is who is on the database? Are they qualified leads who might be interested in your training and would they likely have friends, employers, or relatives interested? The other concern is how often do you send out a blast and what does it say? Too much and viewers will ask to be deleted or simply not read your messages. If there is little interesting or valuable information that also reduces viewership. Every strategy has pluses and minuses. Every strategy has to be measured for effectiveness. With every strategy there are opportunities. You just have to look for them. Best wishes, Susan Dr. Susan Schulz