Hello @chuchuju and thanks for reaching out to us!
When was the last time that you did receive an email notification from Wordfence? Have you received any emails since installing the WP Mail SMTP plugin?
The first thing we can try is to open up the email alerts section (All Options > Wordfence Global Options > Email Alert Preferences). Look for the checkbox that says “Alert me when someone with administrator access signs in”. If this option is checked and the box located under it (Only alert me when that administrator signs in from a new device or location) is checked, you might not be receiving any notification emails for when an admin logs in.
If that doesn’t resolve your issue then send a diagnostic report to wftest @ wordfence . com . You can find the diagnostic tool at the top of the Wordfence Tools > Diagnostics page. Make sure to add your forum username in the subject line. If you could also try Wordfence Tools > Diagnostics > Other Tests and attempt to send yourself an email from both “Send a test email” and “Send a test activity report”. You can share your results in this post.
Let me know how this works for you or when you have sent a diagnostic report over.