For the past three months, I've been getting messages from an email client that does the following. Uses fake email address (new ones every email) so I can't block the email address. Uses images to advertise and makes absolute gibberish so that I can't block key words within the emails. So far I've seen Spanish, non existent words, sentences that mean nothing. Uses titles that are never the same. But I have his IP address and bellsouth server address. The moron can't hide that within the message source. Each message has the same IP and bellsouth client. How can I block the IP address on thunderbird email?