How do i block an email sender?

The simple way is to click the sender at the FROM entry, then click the 'create filter' link, and there set the filter to delete the message. Thunderbird cannot block, but it can delete. To block, I suggest you see if your email provider offers that service on their website. Many do.

This is what I have for astound to block senders. Problem is it does not automaticly go to trash.

Sorry, I don't use the smartphone app. Maybe someone else will respond.