BuddyPress.org

Hey everyone i created a forum for college students named Being Topper .my first domain having 6000+ active users on beingtopper.com but i transferred my all content and redirected the old domain to new domain https://beingtopper.net .
now no one can register on Beingtopper.net as its exam time and internship time for students we can gain maximum input through registration kindly help us in solving the issue

When a person registers on my website using registration form a message appears saying that an activation link has been sent to the email address you provided, but user receives no email.

Please tell me to solve this.
is there any problem in wp_mail or do I need to config something in my hosting file manager?

word press version 4.9.4,
buddy press Version 2.9.3
PHP version 7.1

Problem is in all activation emails, login, lost password, register, registration

other php server Settings Are :

Resource Limits max_execution_time Maximum execution time of each script, in seconds 30

Resource Limits max_input_time Maximum amount of time each script may spend parsing request data 60
Resource Limits memory_limit Maximum amount of memory a script may consume (32MB) 256M

File Uploads upload_max_filesize Maximum allowed size for uploaded files. 32M