How do i send email from Azure function app

Question

I have running Azure function App(in python language), for business requirements need to send emails from function app.

for that, I wrote a python function

Answer 1

Sending outbound e-mail to external domains (such as outlook.com, gmail.com, etc) directly from an e-mail server hosted in Azure compute services is not supported due to the elastic nature of public cloud service IPs and the potential for abuse.  As such, the Azure compute IP address blocks are added to public block lists (such as the Spamhaus PBL).  There are no exceptions to this policy.

Since we do not support running and smtp server from our platform this should not affect us.

The only way to use EMAIL functionality as of now on Azure Web App is via an SMTP relay. A third party service such as SendGrid provides these type of services.

In the Azure Web Apps architecture the actual Web Apps sit behind common Front-Ends which are shared by all the sites hosted on that Data Centre.

There is a possibility that one of the site hosted on that datacenter is sending SPAM emails and this could have the IP address to be blacklisted by the MAIL Servers. So the e-mails sent from that address will be rejected or considered as SPAM by mail servers.   This limitation exists in case of VM or Cloud Services too. Azure uses a pool of IP Address, and these addresses are reused. That means you could get an IP Address which has already been blacklisted, as someone was sending SPAM from that address before and hence your emails would be rejected or considered as SPAM by mail servers.

This is a common scenario in Cloud and it is typically recommended to use an external Mail Service provider like SendGrid for messaging.   SendGrid related articles: 

How to Send Email Using SendGrid with Azure: https://azure.microsoft.com/en-in/documentation/articles/sendgrid-dotnet-how-to-send-email/