Well, your donation will be used for signing the upcomming version of mujMail.
By digitally signing mujMail, the application won't display annoying confirmations ie. when connecting to the Internet. We can't change this security obligation as it is required by phone's security framework, unless we sign the application.
Your donation will also encourage the development of mujMail.
We will appreciate donations of any amount and names of donors will be honorably mentioned.