I'm sorry but I do not sure I understand the question: Lightroom Classic can send photos via email*, but once it's left the sender, there's no way for Lightroom Classic to follow the results of the sent email. That's up the systems that sent the email and the systems that receive the email.
Exactly what issue are you having?
* From the File Menu, select Email photo(s)... where a window will pop up letting you set the size and select the email carrier (for example Apple's Mail proram).
If you want to receive email notifications for new posts made to the Lightroom Classic forum then in the upper right hand corner of the main page for LrC click the word Follow as shown in the image below.
If you want to get email notifications for just the posts and replies you might make to the LrC forum, or any forum on this system, then you have to go into your Account Settings and adjust the Notification settings there.
Click the Avatar in the upper far right hand side and select Account Settings.
In the page that comes up Select the second option at the top, Notifications, and make you selections of what emails you want to receive.
I am going ot move your post over to the Using the Community forum because what you are asking about is for all the different forums on this support site and how to actually Use this Community.