I am crossing an ocean and will only have a satellite phone that can send plain text emails. Is there a way to email an account associated with my blog and have the automatically posted in the blog?
Yes, the feature is sometimes called “blog by email.” It is described on this page
One key element is to set a “secret word” that forms part of the email address. This should be basically unguessable, or else it can become a backdoor into your blog that others can use to post there.