Responded to A POP-UP message to 'update' ThunderBird. Did so, and ever since been continuously been receiving one particular junk mail asking me to " check my credit score ". The same message, probably 15 minutes over last 12 hours. No other incoming messages appear. When I ask Thunderbird to " receive all messages " I get a message box stating that the my account is being 'processed'. I've marked the message as junk and ask for junk-rules to be applied but the offending message continues. It's not a pretty picture!