The most popular linux distibution for developers who are developing .net core applications is ubuntu. Primarily due to it's ease of use and also it comes pre-packied with a number of tools, one of which is the default Thunderbird email client.
As far as email clients go, Thunderbird has all the functionality you need out the box and is easily enhanced by adding and installing add-ons available via the add-ons Manager.
The only issue I have with Thunderbird is that the default UI is somewhat dated and often looks clunky when compared with the other tools I use on a daily basis. Fortunately this is quite easy to change. Particularly after a Github user spymastermatt has crafted custom Thunderbird .css
for the e-mail client’s window chrome.
In the pack are a number of different themes which really add more than a little style to the email client. However, my personal favourite is the full dark
theme.
Custom Thunderbird themes
Although installing a theme is not exactly difficult, it still isn't a complete 1 click easy. But as developers we are no doubt familiar with this.
The reality is that custom thunderbird themes are not themes in the true sense, rather they are customisations of the userChrome.css
to change the look of Thunderbird as it starts up.
All of the theme files make use of the EncodeSans Narrow font and use a custom set of .svg icons to replace the default Thunderbird icons.
Install Thunderbird themes
Download the theme .zip
from GitHub
Once downloaded extract the .zip
archive and rename the folder to chrome
.

Open the chrome
folder and then open userChrome.css
using Gedit or favourite text editor.
Navigate to line 13 or thereabouts and replace @import "themes/system.css";
with @import "themes/fulldark.css";
Save you changes
We can now move the entire folder to ~/.thunderbird/[random letters and numbers].default/
.
To do this navigate to you Home
folder then use Ctrl + H
to see your hidden files.

We are now done and all that remains now is to open Thunderbird and appreciate the theme. Included in the theme pack are several different themes and if you would like to explore the different selections you only need to change the .css
name . i.e. ‘dark.css’, ‘fulldark.css’, ‘light.css’,
etc.

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