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The emails are being sent – if they are not being recieved — thqt’s usually a configuration issue.
Common causes:
– Admin email and send to email are the same and your mail server is rejecting the emails
– SPF records (on the admin email) are not authorizing your server to send emails from that domain
– Spam filter on the receiving email are blocking receipt
Installing a mail logger can help, reviewing SPF records would be wise, switching to a SMTP plugin or transactional email service like Mailgun/Sparkpost/etc. should fix it.