This package provides a minor mode that allows using individual faces for the columns in mu4e’s email overview.

Before:

After:

Before:

After:

mu4e-column-faces is available on Melpa. Download it with the package manager of your choice and then simply enable mu4e-column-faces-mode after mu4e was loaded:

(use-package mu4e-column-faces
  :after mu4e
  :config (mu4e-column-faces-mode))

or

(with-eval-after-load 'mu4e
  (mu4e-column-faces-mode))

The various faces are all named after the headers in mu4e-header-info, e.g. mu4e-column-faces-date.

There are two options that can be set (examples on how to use them are provided in their eldoc):

• mu4e-column-faces-custom-column-handler is function that can be used to handle custom columns.
• mu4e-column-faces-adjust-face is a function that can be used to further customize columns’ faces.

This package does not seem to have an impact on performance. If you want to make sure for your own setup you can set mu4e-headers-report-render-time to t and compare the render times with and without mu4e-column-faces-mode.