In my version of W10 there are two icons that might correspond to OP's description.
One on the left side of taskbar is new email, the number relates to new unread mail which has arrived since I last opened and looked at the email client. Another on right, more of a speech bubble than an envelope, is system notifications. At the moment mine has two messages, one about a problem connecting to my NAS and the other that Windows Defender has checked my system and found nothing untoward. I think it also tells me if I have unread mail but I ignore it's messages about mail as I've always got my email client open.
Last edited by: Bromptonaut on Sat 14 Jul 18 at 09:41
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