I'm using iThemes Security Pro on my wordpress website and I've setup to receive email notifications whenever there is a file change or a malware is found after the daily scan. However 90% of the time the email doesn't work, the plugin give me this error in the notification panel: Could not instantiate mail function.
I wrote to iThemes support and they said I should contact my host. I wonder if anybody has experienced the same issue?
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Is the email address you are having notices sent to using the same domain as your site? It is not uncommon for other email addresses (gmail.com,yahoo.com, etc.) to not work -- for security reasons.
If you are and it is still not working, give an SMTP plugin a try and see if that resolves the issue for you.