I recently started having problems sending notification emails.
For some modules they are delivered, for others they do not leave.
Hi Lucio,
It is possible that the problem you are experiencing with sending emails is due to an issue with your email or hosting server. To resolve this, you can consider using third-party solutions like SendGrid or SendInBlue.
To further assist you, I recommend checking out the following article:
Additionally, you may find this plugin helpful:
We have also been informed that Gravity Forms will be introducing its own SMTP solution. For more information:
Give it a try, and let me know how that goes! 
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