Setting up TLS when using Backend Server

[Prashant Bhivsane]

I want to send the emails via a Backend server, I did setup the Backend server with required SMTP details, I am not able to understand where to enable the SSL

here is the excerpt from the log: 

2024-03-13 11:33:58,283 [587] [] DEBUG o.s.s.c.SMTPClient Server: 250-STARTTLS
2024-03-13 11:33:58,283 [587] [] DEBUG o.s.s.c.SMTPClient Server: 250-AUTH PLAIN LOGIN
2024-03-13 11:33:58,283 [587] [] DEBUG o.s.s.c.SMTPClient Server: 250 Ok
2024-03-13 11:33:58,284 [587] [] DEBUG o.s.s.c.SMTPClient Client: AUTH PLAIN AEFLSUFSSUdJRUZASWFASSDWFVXAWEFASPOOSANX>

2024-03-13 11:33:58,421 [587] [] DEBUG o.s.s.server.Session Server: 530 Must issue a STARTTLS command first - Backend rejected connection>
2024-03-13 11:33:58,448 [587] [] DEBUG o.s.s.server.Session Client: QUIT
2024-03-13 11:33:58,448 [587] [] DEBUG o.s.s.server.Session Server: 221 Bye

Could someone point me in the right direction? Not able understand where I went wrong.

I even tried using the jks

[HONTVÁRI Levente]

Hi,

I had success with modifying the service file to include java system properties related to TLS.

Specifically the resulting command line is like this:

java -Djavax.net.ssl.keyStore=conf/keystore.jks -Djavax.net.ssl.keyStorePassword=PASSWORD ...

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