How to show emails in HTML view by default in Horde on Plesk server?

Question

How to show emails in HTML view by default in Horde on Plesk server?

Answer

By default, inline HTML viewing is disabled in Horde. To enable it, follow these steps:

1. Connect to the server via SSH.

2. Create mime_drivers.local.php files:

   # cp -a /usr/share/psa-horde/config/mime_drivers{,.local}.php

   # cp -a /usr/share/psa-horde/imp/config/mime_drivers{,.local}.php

3. Set the 'inline' parameter from false to true:

   # sed -i.backup "s/'inline' => false,/'inline' => true,/g" /usr/share/psa-horde/imp/config/mime_drivers.local.php

   # sed -i.backup "s/'inline' => false,/'inline' => true,/g" /usr/share/psa-horde/config/mime_drivers.local.php