I have over 7,000 emails currently on my server and thought I should probably delete them, but I'm not sure how to do that. I have gone through the steps to not keep future emails on my server but I don't know how to delete what I have on there now. Does that many emails on my server make a difference?
Most have a checkbox to select all messages before you delete them.
If your email service doesn't have a convenient way in the webmail, they usually also support IMAP so you can delete them with an email client such as Mozilla Thunderbird.