I send lots of email that reference code.  Either with snipits, or mentioning variable names or file names etc.

So I would I disable any spell check of any word that has an underscore character as part of it.  For example dont_check_this_var.

I specifically am concerned about settings in Outlook

Right click on the word, and select "Ignore all".

To disable spellcheck,

• Click the File tab, and then click Options. 
• Click Mail , and then click Editor Options. 
• Click to clear the Check spelling as you type check box. 
• Click to clear the Mark grammar as you type check box.

Tylor Wang
TechNet Community Support

• Marked as answer by Tony Chen CHNMicrosoft contingent staff, Moderator Monday, January 27, 2014 5:54 PM

This is NOT an answer at all.

Person (and me) want to exclude words with underscores, just like "words with numbers" ...

I do NOT want to turn off spell check, just improve it.

Thanks.

SM