Thanks for the quick reply.
The 456 versus 465 was a typo 
, but just in the post, not in the file 
I didn’t know I had to create an app password in my Google account for this BW server, but I created one now.
So I tried two options:
globalSettings__mail__smtp__host=smtp gmail com
globalSettings__mail__smtp__port=465
globalSettings__mail__smtp__ssl=true
globalSettings__mail__smtp__username=xxxxxxxxx@gmail com
globalSettings__mail__smtp__password=xxxxxxxxx (new Google app password)
lobalSettings__mail__smtp__host=smtp gmail com
globalSettings__mail__smtp__port=587
globalSettings__mail__smtp__ssl=true
globalSettings__mail__smtp__username=xxxxxxxxxx@gmail com
globalSettings__mail__smtp__password=xxxxxxxxx (new Google App password)
Unfortunately, no dice. No e-mails are coming in.
Is there a log file that would show any reasons for the e-mail not being sent