Send emails with .NET

using Emailr;

builder.Services.AddOptions();
builder.Services.AddHttpClient<EmailrClient>();
builder.Services.Configure<EmailrClientOptions>( o =>
{
    o.ApiToken = Environment.GetEnvironmentVariable( "EMAILR_APITOKEN" )!;
} );
builder.Services.AddTransient<IEmailr, EmailrClient>();

using Emailr;

public class FeatureImplementation
{
    private readonly IEmailr _emailr;


    public FeatureImplementation( IEmailr emailr )
    {
        _emailr = emailr;
    }


    public Task Execute()
    {
        var message = new EmailMessage();
        message.From = "Acme <onboarding@emailr.dev>";
        message.To.Add( "delivered@emailr.dev" );
        message.Subject = "hello world";
        message.HtmlBody = "<strong>it works!</strong>";

        await _emailr.EmailSendAsync( message );
    }
}