Unable to resolve “No address associated with hostname” on azure web service

[daveMitra]

Hi,
I am quite new in azure and facing issue in my deployed web app written in flask.
I have built a solution using flask where, user can send mail to my company mail box. The main code written on application.py is below

from flask import Flask, render_template
from flask_mail import Mail, Message

app = Flask(name)
app.config.update(
DEBUG=True,
MAIL_SERVER='My Company SMTP MAIL SERVER',
MAIL_PORT=My Company SMTP PORT NUMBER,
# MAIL_USE_SSL=True,
MAIL_USERNAME='[email protected]',
)
mail = Mail(app)

@app.route('/')
def mailSend():
try:
msg = Message("Send Mail Tutorial!",
sender="[email protected]",
recipients=["[email protected]"])
msg.html = render_template('linkPage.html')
mail.send(msg)
return 'Mail sent!'
except Exception as e:
print(type(e))
print(e)
return 'error'

The sender mail address is shared mail and does not need password to send any mail. I already tested the solution on my pycharm IDE and worked totally fine without any issue. However, its throwing error on azure app service after deploying over there. Its saying gaierror'> [Errno -5] No address associated with hostname

Any suggestion on this please let me know.

FYI, I didnt mention my company SMTP server name and port number for data sensitivity