Outlook was good enough to tell me "presumptious" wasn't the way to spell it. When I went to the online dictionary and plugged in the wrong spelling, I got just what I needed from Wiktionary:
Common misspelling of presumptuous.
It's a great idea we should all remember: When people make a little mistake, don't make a big deal out of it. Let them know others make that mistake too and give them the accurate info. Then, let it go.