Using multiple SMTP credentials

[sjd2021]

In my application, users need to be able to supply their own SMTP host/credentials for their company. Currently, I don't see a way to support using different SMTP servers to send emails at "runtime" (post-DI). Am I overlooking something?

[manio143]

You can configure the ISender interface using any other service at runtime. Example:

services.AddOptions<SmtpSettings>();
services.AddScoped<ISender>((IServiceProvider provider) =>
{
	var settings = provider.GetRequiredService<IOptionsSnapshot<SmtpSettings>>().Value;
	var client = new SmtpClient()
	{
		Host = settings.Host,
		Port = settings.Port,
	};
	return new SmtpSender(client);
});

You can define your own service to supply the right credential in the context you're in.