Email Spoofing program

Hello Freelancers I will first like to point out that this is for educational purposes only. So I have a few ideas for this app ad I would like to know if one of them can be done. IDEA #1 POSSIBLE I want this app to spoof a email and I need to be able to get a reply. For the reply feature we can have it where I can choose my own domain so when they reply, it will be relayed to my email. IDEA #2 Don't know if it's possible Now I have a another idea but don't know if it's possible so I need someone to comment on this. For the reply feature I was wondering if it's possible to have the reply box say it's from the same domain I'm spoofing. Let's say you got a email on outlook from xxxx now when you reply you would see the exact email in the (TO) REPLY BOX. So instead of having a different domain in their you would have the same. Now you might ask how to get a reply then? Well I was thinking if it was possible to have the reply email inside the HTML coding. Every email as a html source and I was thinking that if we some how made it when someone looks at my email they would see where the email came from and they will also see what email their replying to, which to them would be the same email. But when they reply instead of it going to the email (INSIDE THE "TO REPLY BOX") The app will send the email to the domain of my choosing (which will be inside the header) Now of course anyone can view the source and then know right their that it's spoofed. So if all that is possible we can encrypt the html source. Again I don't if it can be done I do hope you guys got a idea on what I want to do. If Idea #2 can't be done I will be happy with Idea #1. Thank you and I am hoping I will get a quote and go from their.