I understand the project description very well. I have done a very similar task a few days back for someone. So I will be able to develop this application per your expectations (may be even better). I am proficient with selenium, chromedriver, csv file manipulation in python,etc. I also have good knowledge of custom email html templates, MIME type emails, python requests, base64 encoding and gmail api. I suggest you to use the latest Gmail api instead of selenium in order to make the application much fast and accurate. Doing so the application will definetly give better results.
I you want then I will do in selenium only, what ever you choose.
Please message me so that we can complete the project quickly. Thank you.