why do some e-mail addressees show up red in TO:
When adding addressees to a message, some of them show up red. Why?
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In the past it meant that the address that you entered is not in one of your address book. It would still send but is was just a heads up to be sure you got the address correct. Since version 31 was released it is a reminder that this version totally broke the address book. They are trying to fix it.