You need to generate an app specific password in google account for deepin mail, working pretty much the same way as Apple specific password authentication.
Read this link https://support.google.com/accounts/answer/185833?hl=en
Then gmail account willl work flowlessly!
Hope this helps :-)
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Deepin mail client security problem with Gmail account
Unable to use any GMail account with the Deepin Mail client, even if the password is correct, i always get a login/password error.
The reason is that GMail blocked the Deepin Mail client access, unable to register the Deepin Mail client as a tier application
Frequency: Always (no functional solution)