Netscape's mail handling capability is entirely separate from Eudora. That way you will get a copy of the message when you next check your email with Eudora. Someone sent me an email message. Most messages arrive within minutes. Messages with file attachments and messages from behind email gateways will take longer.
Email works fine.
Netscape used to work. This is usually a sign that Netscape's cache on your machine has become corrupt. The simplest way to fix the problem is to delete the cache folder. On Windows and Windows 95 systems, it is in the Netscape folder. On Macintosh systems it is in the Netscape Preferences folder.