How to catch success of failed emails ?

Hello,

I’m sending emails when a custom post type is published. I store the wp_mail() return value as a post meta to display a message in the admin after an email has been sent.

Now that I have enabled WP Mail SMTP, I get an empty value returned from wp_mail().

How could I determine if the email has been sent or not ?
That would be great to return a boolean value as wp_mail().

Thanks for your help