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Error: javax.mail.MessagingException: Could not connect to SMTP host: smtp. gmail.com, port: 465, response: -1
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What's an SMTP port & how to choose the right one | Postmark
Which SMTP Port to Use for Email: 25, 587, 465, or 2525?
What's an SMTP port & how to choose the right one | Postmark
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SMTPS: Securing SMTP and the Differences Between SSL, TLS, and the Ports They Use
