i receive messages from a certain mail recipient in thunder bird and certain email from this perdon do not come through.y thunderbird is through Comcast mail it shows up in comcast.mail but not inThunderbird mail what i get in thunder bird is a blank page with little plus signs. as i said it come through on comcast mail. it seem like it is only this recipient. he is using a spam fighter I am using avast anti virus. it worked afew months agao but now i can not receive them. image below is what i get