Occasionally you could run into issues with a user receiving emails. 99.99 % of the time this is caused by the email provider blocking OR marking our emails as spam.
You could try the following:
- Instruct the user to add the from address (Could be found in Config > Email Configuration) to their safe senders list
- Try setting up a BCC email (Config > Email Configuration) and track emails being sent out
- If any of the above fails, please instruct your user to contact their email provider to unblock us as spam