I have a dial-up account w/Earthlink, and use Avast Home 4.7 antivirus and Mozilla Thunderbird 1.5.0.9 email client. I worked with earthlink support because my email times out when trying to send 100K of jpg photo attachments. The smtp server isn't accepting the upload. After looking at everything, Earthlink had me shut off my Avast email provider, and said it was causing problems. Indeed, I can send email with NO PROBLEM when I shut the provider off. Is there a fix that anyone knows of??