Reading mail

The tool bar gives you several options:

Previous mail
Read the previous mail in the inbox/outbox list
Next mail
Read the next mail in the inbox/outbox list

ASCII/Rich text
Switch between standard text (using ASCII line breaks) and HTML/RichText view (requires HTML line breaks).

Attachment available
Click on the icon to open the attachment view.

Reply to the current mail on a single click.
If you click and hold this icon, a popup menu is opened with several options:
Reply to all recipients
Forward the mail

Remove mail
Removes the currently selected mail

Mail download
Completely fetches a mail if it has not been downloaded yet. This icon only appears if needed.