Can't check the response of send()

[lucafaggianelli]

Describe the bug
The response of the method mailer.send(mail_body) is a string that doesn't allow to check the response code.

To Reproduce
Steps to reproduce the behavior:

1. Call mailer.send(mail_body)
2. Check if the email was sent or not

Expected behavior
I expect the mailer.send(mail_body) method to return a proper HTTP response or raise an Exception in case of error

Given the current implementation of the method send, please just return the response instead of a str, today implementation:

return f"{request.status_code}\n{request.text}"

Environment (please complete the following information):

• OS: macOS
• Python version 3.12
• SDK version 0.5.8

Additional context
Add any other context about the problem here.