I have been using Spark mail app on my iPhone for half a year. I enjoyed its advanced features, but I never thought about using it on my laptop. After all, I was so familiar with Apple Email, and it did the job. However, I recently encountered some problems with Apple Email. When I sent an email to a client, Apple Email automatically attached a jpeg image file as an inline image, not as an attachment. The client’s company’s email system could not display the inline image properly, so I had to resend the image as an attachment. After what happened, I realized that it was the time that I…