Jira requires a working mail server to send emails, and it uses the SMTP (short for Simple Mail Transfer Protocol) to communicate with the mail server. Because of this, you will need the following:

• A working mail server that is either on the same server as Jira or accessible over the network
• Connectivity details, including the mail server's host, port, protocol (SMTP or secured SMTP), and SSL certificate if it is using a self-signed certificate
• Authentication details for Jira to log in to the mail server