No matter where in the world you are, your e-mail is easily accessible to you. Some e-mail clients are unable to download very large messages, particularly if they contain attachments, and you may receive a POP error message. Most clients allow you to enter a limit for the size of the messages you want to download. They may also pull down the headers of larger ones so you know they are there. Check under Preferences for the option to set a size limit.
Support can delete any large messages if necessary.
Spamming is electronic junk mail. It depends on the browser you are using. Find the Preferences, then either the General or Navigator option. When you next launch your browser, this will be the page that loads automatically. Usually, you are trying to go to a URL that does not exist.