If you are using a pop3 or imap server, here is a fix:
start/Accessories/r-click on Command prompt and select "Run as
administrator" and then type: netsh interface tcp set global
autotuninglevel=disabled and then hit "Enter" key and it should say "ok". I
would restart pc just to be sure.
I know of at least 5 people/org in which this has fixed the issue.
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