Confirmation email to post by email

Support
2

In mailing list mode you can configure an “echo mode”

The image shows a screenshot of a mailing list settings page with a checkbox for enabling mailing list mode, followed by a prompt to send an email for every new post except the sender's own, with an option to send an email for every new post after 140 per day. (Captioned by AI)
The image shows a screenshot of a mailing list settings page with a checkbox for enabling mailing list mode, followed by a prompt to send an email for every new post except the sender's own, with an option to send an email for every new post after 140 per day. (Captioned by AI)563×291 35.2 KB

Particularly by selecting “send an email for every new post” in your email preferences.

However, there is no mechanism built in to Discourse for a “email confirmation” when a message is posted on the forum. I recommend you make a Contribute > Feature request about it.