claws-mail from Maemo:Mer:Extras:Devel project
Select Your Operating System
Add repository and install manually
For MerTesting Ubuntu 9.04 run the following:
Keep in mind that the owner of the key may distribute updates, packages and repositories that your system will trust (more information).
echo 'deb http://download.opensuse.org/repositories/Maemo:/Mer:/Extras:/Devel/MerTesting_Ubuntu_9.04/ /' | sudo tee /etc/apt/sources.list.d/Maemo:Mer:Extras:Devel.list curl -fsSL https://download.opensuse.org/repositories/Maemo:Mer:Extras:Devel/MerTesting_Ubuntu_9.04/Release.key | gpg --dearmor | sudo tee /etc/apt/trusted.gpg.d/Maemo_Mer_Extras_Devel.gpg > /dev/null sudo apt update sudo apt install claws-mail