The offer seems a bit unclear.

In Tier 1, you are offering 2,000 emails per day per user. By "per user," do you mean one email address? If so, how can we send 2,000 emails from a single Gmail address, considering the daily sending limits? (Using Gmail Account)
Additionally, is it possible to send a single email instead of a campaign? Will your tool provide insights on whether the recipient has opened or seen the email? I am looking for a complete tracking system.
Thank you