1- If you have not receive email yet then Please create a domain email like
[email protected] and then come to
WordPress Dashboard --> Settings --> General --> Here you will see Email Address Option .
Please change this to domain name email.
Then come to WordPress Dashboard --> Classiera Options --> Contact Page --> Also change email from here.
Then post new ads, I hope you will receive email.
2- First you need to apply point first if that will not work then install this plugin.
https://wordpress.org/plugins/wp-mail-smtp/
Configure this plugin. I am sure you will receive email.
3- If still no email then you need to contact with your hosting support. Because some hosting server blocking wp-mail function.
Thanks