@WatsonB: Do you only encounter this issue while composing emails, or have you noticed it in other apps that use the Samsung Keyboard e.g. Messages? If it's an email-only issue, which app are you using? If you continue to type your message, and ignore the white underline, does it remain there?
@WatsonB: Are you able to provide a screenshot of what you're seeing? On the Samsung Keyboard, words will be underlined in grey if they have been auto replaced, so it's possible that this is what you're experiencing. As a test, try typing in a word with incorrect spelling or punctuation e.g Cant instead of Can't, and check to see if the line appears under the corrected word. Please make sure to put a space after the word to allow auto correct to kick in.
