I can agree with you about the theme, that is a matter of a difference of opinion. The way you explain it makes sense.

Is there a minimum number of mails to send in order to get credit in mastery? The reason I ask is because I did not get credit for the 1 mailing I did do.

Also maybe you could change the "To complete this task you must send 25 emails at RealTimeAdz" to something more clear. Maybe to "To complete this task you must do 25 emailings at RealTimeAdz". The way this is written I should have already achieved the first 3 check marks for this section. The progress bar also reinforces the idea that it is for each email sent "0/25 Emails Sent"