I will try it right now in this reply box...
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Sincerely,
Joe Blow
ABC Hardware
'Right Tools For The Job'
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Yes, it works here. But not while composing an email in my Roundcube webmail. I have tried placing my cursor before 'Sincerely', after it, also before and after 'Right'. All it does on my Mac is create another empty line. I called Mac. They had no suggestions. Someone on an Apple forum suggested going to keyboard settings and changing something about 'period after X'. That setting doesn't even exist.
Anyway, if I only have this issue with Roundcube, clearly the problem is with PC not my computer. I even tried turning off HTML in Roundcube. Zero effect.