Take a look at the following reference link - https://confluence.atlassian.com/adminjiraserver/configuring-jira-application-emails-938847632.html
It has the detailed step-by-step configuration setup for your DC environment. Hopefully, your org has already migrated to Data Center or Cloud env as the Server version env will be de-supported by the end of Feb 2024.
Best, Joseph Chung Yin
Jira/JSM Functional Lead, Global Technology Applications Team
Viasat Inc.
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