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I'm working on the Magento 220.127.116.11.
When the user (guest or logged in) type their email for subscription they don't receive the confirmation email while all the setting for has been done by me.
This might sound a bit stupid but has your customers checked that the emails don't go to their spam folder? This is the first thing that comes to my mind.
If that's not the problem I recommend checking that other emails your magento might send are working, so you can narrow it down a bit more.
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