The Atlassian Community can help you and your team get more value out of Atlassian products and practices.
i want to buy the software
i want to know more informations about
your application security
can we use our email server to send emails
can i use on primse server
to register users
I find this page on compliance really useful. Yes you can connect Jira to a mail server and use it to both send email notification and create issues by configuring mail handler.
Jira can be installed on prem as well.