Don't worry too much!
Hi there,
squirrilmail does get it's mail via POP3 (Post Office Protocol 3) or IMAP 4 (don't know what this stands for.
It saves the mail in a mailbox file or in a maildir. your site should be in a total different area (usually a directory called "httpd"). Your ISP does not permit you to delete anything in the e-mail file/folder.
But if you want to be absolutely sure, take an FTP tool such as WS FTP and delete all files that end in .htm or .html and everything in .gif, .png. If you have PHP or other things deployed, you probably should know what you do.
Have fun
K<o>
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