From which version you have updated?
I see your previous email problem is solved in https://www.shamimsplugins.com/support/topic/email/. What did you changed that time?
Also please check is normal email sent from your website? eg register, lost password email?
Please go to Dashboard > Front End PM PRO > Settings > Emails and see if all fields are filled.
Nothing is changed in this version regarding email. So it should not have any issue for this update.
Are you using same domain email in “From Email”? are you using any SMTP plugin? in front end Settings page is “Email me when I get new messages?” checked?