That cute picture attached to your email might be a virus in disguise. Many email clients, including Gmail and Outlook, are configured by default to block automatic picture downloads from the Internet. It’s best to keep the default settings because they can help you:
- Avoid viewing potentially offensive material (when external content is linked to the message).
- Keep malicious code from damaging the data on your computer.
- Decide whether a particular image warrants the time and bandwidth required for downloading it, if you are on a low-bandwidth connection.
For more information read Block or unblock automatic picture downloads in email messages.