Sometimes after I launch an email campaign, I have visitors complaining that my site won't load (from links in the email). Usually it's a matter of visitors getting the standard "site not available" error message in their browser. In most cases, the site comes back up in a minute or two.
Since all my links are working properly, I'm wondering if my web hosting package isn't robust enough to handle the sudden surge of traffic (which includes people downloading PDFs from my site). Actually, I've noticed this happening to myself when I try to visit sites via other people's email campaigns.
What's the best way to investigate the source of the problem? I'm assuming there's something in my control panel that would tell me if there's a problem.