chart the amount of emails sent each day

I’ve been reading the posts on this forum for a few days and haven’t found anything that solves my problem.
I need to chart the amount of emails sent each day. I have a list of the date and time the email was sent. I see it with the Time in the Y-axis and the date on the x-axis. Each email sent would be represented as a dot in the appropriate date/time intersection. I included a picture of what I thought the chart might look like in the attachment if my description is confusing.

Help!!!

This sounds great, I'm excited to try it, but I don't understand it!!! lol, can you give me a real example in excel?

Also, I have a list of times that represent my arrival time, so would it be possible to lay these lines or different color dots over the emails?

Thank you so much for your reply!!!

I am not as advanced and can't get it to work. I've attached my attempts.

Thanks again,
Regan