[FEATURE]: Resend Rate Limit Handler

[joshmedeski]

Is your feature request related to a problem? Please describe.
Add a rate limiting handler when using the Resend service, so as the project grows we can handle sending emails without Resend failures.

Describe the solution you'd like
I'm open to the solution, but a simple loop that breaks down sending emails can be added to the function that sends the emails.

Describe the benefits of your solution

• Scale without Resend failures

Additional context
I've implemented this kind of system before (with code), so I'm happy to contribute.