Are you planning on leaving this computer on at all times? The reason I ask is because in order to do what you want, the computer would have to be on at all times in order for this to work. I'm not even sure if Excel allows for automatically doing something like that without input from the user. I can definitely see if it's possible, but if you don't want to/plan on keeping this computer on at all times, then the information wouldn't be helpful for you
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In regards to changing where those emails come from, what are you looking for exactly? Do you want each email to come from an separate email address? I'm just trying to get an idea of what you're actually asking.
In my opinion, what you are trying to do shouldn't be done a computer. This is a project that should be moved to a server. This will allow you to remove the constraint of using Excel and opens endless possibilities of what you can do. It will also make it easier in my opinion. You might be able to accomplish this without having to pay anything. I know there are free web hosting servers out there, but most are limited in what they can do. You can get a decent server pretty cheap, depending on the specs you need. I personally have a server that I spend about $30 a year for and I have full access to do everything on the server. Worth it in my opinion. This is just a better alternative in my opinion. If you want to stick to the Excel route, that's fine, assuming it's possible. Let me know what you think.
In regards to changing where those emails come from, what are you looking for exactly? Do you want each email to come from an separate email address? I'm just trying to get an idea of what you're actually asking.
In my opinion, what you are trying to do shouldn't be done a computer. This is a project that should be moved to a server. This will allow you to remove the constraint of using Excel and opens endless possibilities of what you can do. It will also make it easier in my opinion. You might be able to accomplish this without having to pay anything. I know there are free web hosting servers out there, but most are limited in what they can do. You can get a decent server pretty cheap, depending on the specs you need. I personally have a server that I spend about $30 a year for and I have full access to do everything on the server. Worth it in my opinion. This is just a better alternative in my opinion. If you want to stick to the Excel route, that's fine, assuming it's possible. Let me know what you think.