Connection timed out error while sending mail from azure web app

Question

Hi,
I have created a flask app which sends mail to my colleagues in my organization. The mail client is outlook. My code is working properly and can send mail to the outlook email address but, once I deployed to azure web app, I am having issue of "Connection timed out error". I am using my company's SMTP relay service to send mail but, its failing somehow.

My azure web app is integrated with sub-net of Virtual network of azure web app and the IP address space of sub-net has been added into my company's SMTP relay service so that my web app can connect with the company's private network and send mail.

Can anyone suggest on the issue and how to resolve this.
I have mentioned the flask code below

from flask import Flask, render_template  
from flask_mail import Mail, Message  
  
app = Flask(__name__)  
app.config.update(  
    DEBUG=True,  
    MAIL_SERVER='COMPANY SMTP SERVER NAME',  
    MAIL_PORT=25,  
    MAIL_USERNAME='XXXXXX@ge.com'  
)  
mail = Mail(app)  
  
  
@app.route('/')  
def mailSend():  
    try:  
        msg = Message("Send Mail Tutorial!",  
                      sender="XXXXXX@ge.com",  
                      recipients=["YYYYY@ge.com"])  
        # msg.body = "Yo!\nHave you heard the good word of Python???"  
        # msg.html = render_template('text.html')  
        msg.html = render_template('thankyou.html')  
        mail.send(msg)  
        return 'Mail sent!'  
    except Exception as e:  
        print(type(e))  
        print(e)  
        return 'error'  

FYI, Dont want to use Sendgrid as SMTP relay server

Answer 1

Hello,

In-order to send through your company's email server, you should have required connector created there which allows to send on behalf of your Azure App. In exchange server, you need a Receive connector which allows the Public IP address of your web app to send through the server. Similarly, check your company's email admin to create the necessary connector to send sucessfully

Please mark as "Accept the answer" if the above steps helps you. Others with similar issues can also follow the solution as per your suggestion

Regards,

Manu