Hello @naryy,
Hope everything is going well.
We assume you want to resend post notifications for already published or republished posts or reschedule posts.
If yes! then in regards to the above inquiry, we have some information to share with you.
Once a post has been published an id is assigned to it in the database (Meta key) that helps to admin change/edit the post without notifying the user or helps to restrict resending of post notification of the same post.
Please consider it as a feature we have recently updated in the plugin for this we have received many requests to implement it.
While in your case you can delete the Post field(id) from the post settings to send a post notification, we would request you to click here, in the video, we have deleted the Post field and then published it.
By doing so, you will receive a post notification of duplicate posts too.
Whereas, This is a screen recording where I am showing the post notification of the same post that has already been published, deleting the meta key, then changing the status to Draft from Publish and then Publishing from Draft and receiving notification again as shown in the mentioned video.
By following this surely you will receive a post notification.
While it is true that you are receiving notification of your old post because the key did not exist when it was published, so when you republish it, you will receive a notification, but if you retry you will not receive any notification.
Note: By default, custom field IDs are disabled in posts. You must enable them. In order to facilitate your access to the following setting, I have shared a screen record for your reference. click here to view.
Let us know how it goes on your end. If you have any other doubt do let us know.
Hope the above information helps you.
Thank you!
Stay safe & healthy.