Microsoft Outlook Express Alternative
Forget that there is native Linux e-mail clients as they all lack certain needed features. Instead, use Thunderbird. It's very close to Outlook feature wise.
From Mozilla's Thunderbird site: "Thunderbird delivers. Enjoy safe, fast, and easy email, with intelligent spam filters, quick message search, and customizable views. Brought to you by Mozilla, Thunderbird makes email better."
Run this command in your Ubuntu terminal to install Thunderbird:
sudo apt-get install mozilla-thunderbird
Tip: Hidden Thunderbird preferences
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