> Is there such a thing as software or a script that can return > suspicious > e-mails to their point of origin that would make them look like they > were > undelivered? Most email clients have a bounce to the sender option. The problem with this option are: - most of the suspicious mail uses spoofed email addresses (and if the spoofed address is real, the poor guy will get tons of unwanted bounced emails) - bouncing to the sender, could be read as a confirmation that your email address exists. > I get the impression that much Spam is sent on spec and that > both opening or deleting them merely confirms an address to be valid. Deleting (w/o opening) does not send any confirmation. Opening, gives a confirmation only if there are hidden links in the email. I don't know for other programs, but in Mail if a program is labeled as junk, any link/image won't be displayed (thus you can consider them safe). In this view, it is safer not to have the viewer panel open in the Inbox: the viewer panel opens automatically any selected message in he mailbox. > Are there other ways of making my Mac and my addresses more invisible? - Give your email address only to "trusted" people (although this would label as untrusted all PC users without AV software) that won't disclose it on the web. Use a junk email address for lists and for whatever cannot be trusted. Silvo Silvo Conticello Albook 17" 1.5GHz/1.5Gb RAM/80Gb HD/OS10.3.9 iMac 1GHz/500Mb Ram/80Gb HD/OS10.4.1/17" display Cambridge UK