Hi @amar amarendra
A 504 error is the Gateway Timeout error. Meaning that your Jira is unable to connect to your mail server within the required time. Check your logs, they will provide more information than just the 504 error code.
Mostly, it can be because of a firewall and port configuration, so I'd suggest checking them.
Ensure you're using the correct port 465 for SSL, 587 for TLS, 25 for non-secure connection.
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