Is it cloud or servder edition? If it is cloud, as I understand you have followed this instuction. https://confluence.atlassian.com/adminjiracloud/configuring-jira-cloud-to-send-emails-on-behalf-of-your-domain-900996548.html
Is that correct?
If your instance is server, could you provide answer kindly.
Could you provide the error log, from you JSD instance?
Additionaly, I have seen this suggestion https://jira.atlassian.com/browse/JRASERVER-60706
...be more productive while being fun to use at the same time. For some, getting started can be a bit intimidating. This is especially true if Jira Service Desk is your first exposure to Atlassian...
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