[java] Javamail Could not convert socket to TLS GMail

The first answer from @carlos worked for me:

session.getProperties().put("mail.smtp.ssl.trust", "smtp.gmail.com");

I have tested the property below and worked perfectly for me too:

session.getProperties().put("mail.smtp.starttls.enable", "true");

The two properties alone solved this type of problem, but by guarantee I used both.

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