[Feat]: Webhook for events on email

[marconneves]

I see in the readme that there is a pending webhook feature. Do you plan to build it in the near future? Or is it not a priority?

[KMKoushik]

this definitely a priority. if you have any ideas on how to implement this i'm all ears

[Abhijitam01]

Here’s how I’m thinking about it:
We can hook into key email events like "sent", "failed", etc.
Then allow users to configure webhook URLs for those events.
Whenever one of those events happens, we send a POST request to the respective URL with some useful data (like recipient, subject, status, timestamp, etc.).
Optionally, we could sign the payload for security, and even add retries if the delivery fails.

[marconneves]

Implemented on #184