I am having the same problem - this has happened before and I made my browser smaller (CTRL -) and it would eventually appear, but that isn't working today. I can't send mail because it is missing.
I tried logging out and logging back in.
I normally use Chrome but also tried Firefox - neither one worked.
I'm on a Windows 10 laptop which has been working fine, up until now, but somethingis keeping that SEND button from showing up in both browsers.
Frustrating. I have email to send regarding flight reservations and I'm kinda stuck!
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