A smart queue solution

I would like to address such a problem: I have an HTML form (for example, a register form) that sends email. Now I am sending it as part of the page request. Obvious disadvantages:

• makes the request longer
• sometimes the smtp server is down, or timeouts and emails are not sent

When working with PHP, I used a queue-based solution - I queued the / xml object on the host, and then some client checked this queue. If the queue task was successfully processed, it removed the task from the queue. I wonder if there is a similar implementation on the Windows / .NET platform?

Thanks Paweł