self hosted email invites (smtp) not working

I am having issues getting invite emails sent out to our selfhosted instance.

We deployed on azure and opened up the outbound port 587 and realized that was the port used by mailgun. So we opened up SMTP port 25 for outbound. Still not working. attached image is of the .env file smtp settings.

Thoughts?

TL;DR

Developers having issues with self-hosted email invites not working. They opened outbound port 587 for Mailgun, then tried port 25 for SMTP in Azure VM networking settings. Invite emails still not sending. Need advice. Solution: The issue could be related to SMTP server configuration. Check the settings in the .env file to ensure they are correct for sending emails.