How can I fix email confirmation - in .NET Core, it doesn't work

Question

I already have a register action

public async Task OnPostAsync(string returnUrl = null)
{
            var useremail = _userManager.User         


        

Answer 1

"Solved" I asked Sendgrid, and I was told that I cannot use my yahoo email (or gmail,...) as the sender email; this is part of the answer: "Yahoo observes an email security standard called DMARC. DMARC instructs email providers to reject messages where the From domain is a Yahoo domain, but the message originates from a non-approved domain server/service." So I need to use my own mail domain;

Answer 2

When I create a new web application with individual user accounts, this works perfectly, but I noticed that when you scaffold identity and override all pages to have control into an existing app, the behavior you are experiencing is the usual.

Here is how I fixed it:

If you open the file Areas/Identity/Pages/Account/RegisterConfirmation.cshtml.cs look for the comment Once you add a real email sender, you should remove this code that lets you confirm the account, comment everything below that line before the return Page() statement and that should do the job.