Before we jump in into sending emails, let us first see some pros, cons of using Brevo (SendInBlue). Also, please note that in no way, Sendinblue sponser me 😔.

Pros:

- Quick Setup
- Minimal Code (for simple transactional emails)
Cons:
- Documentation can be significantly improved :(

Let's install some requirements first with pip install -r requirements.txt

fastapi==0.101.1
uvicorn==0.23.2

python-dotenv==1.0.0

requests==2.31.0

Let's jumpstart on integrating Brevo with FastAPI. I would like to create a generic service first that can be consumed with Python. And then simply call the function in our fastapi route.
 

import requests
import json
from config import settings


def send_email(to_email: str, subject: str, text_content: str):
    url = "https://api.brevo.com/v3/smtp/email"
    payload = json.dumps(
        {
            "sender": {"name": "Sourabh", "email": settings.EMAIL_FROM},
            "to": [{"email": f"{to_email}"}],
            "subject": subject,
            "textContent": text_content,
        }
    )
    headers = {
        "accept": "application/json",
        "api-key": settings.BREVO_API_KEY,
        "content-type": "application/json",
    }
    response = requests.request("POST", url, headers=headers, data=payload)
    print(response.text)

Yup, that's it, this piece of code is sufficient to send a simple transactional email. We would also require a file where we can store our configuration variables. It can be a config.py file that reads configurations from a .env file.
 

import os
from dotenv import load_dotenv

from pathlib import Path

env_path = Path(".") / ".env"
load_dotenv(dotenv_path=env_path)


class Settings:
    EMAIL_FROM = os.getenv("EMAIL_FROM","[email protected]")
    BREVO_API_KEY: str = os.getenv("BREVO_API_KEY")


settings = Settings()

Obviously, we would need the .env file to have the secrets. The .env file is below:

BREVO_API_KEY=xkeysib-watchtheseanimes:dororo|opm|deathnote|andAOTforsure

Almost, there, We need to plug the send_mail to our main.py file.

from fastapi import FastAPI
from services.brevo import send_email


app = FastAPI()


@app.get("/")
async def root():
    send_email(
        to_email="[email protected]",
        subject="Is Python SDK work done?",
        text_content="Hi Sourabh,\nIs Python SDK work complete or not?")
    return {"message": "Hello World"}

Now, if you visit: 127.0.0.1:8000, You should receive mail, also the terminal would say something just like this

INFO:     Started server process [23844]
INFO:     Waiting for application startup.
INFO:     Application startup complete.
{"messageId":"<[email protected]>"}