The mode to use for displaying mails. "normal" makes Evolution choose the best part to show, "prefer_plain" makes it use the text part, if present, and "only_plain" forces Evolution to only show plain text
The mode to use for displaying mails. "normal" makes Evolution choose the best part to show, "prefer_plain" makes it use the text part, if present, and "only_plain" forces Evolution to only show plain text