You can add colored labels to emails in order to categorize them. This is similar to Categories in the other Evolution windows.
You can search for messages with specific labels by using the quick search dropdown. Also, search folders can be created based on labels.
To assign a label to a message, right-click the message, click Label, and choose the label to apply.
You can also quickly add a new label by choosing New Label.
You can add, edit and delete all labels under Edit ▸ Preferences ▸ Mail Preferences ▸ Labels. Note that you cannot remove the default labels.
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