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http://www.kb.lesolson.com/InstantKB2016/KnowledgebaseArticle50515.aspx
If your device or application does not support SSL, connect to aspmx.L.google.com on port 25. You must configure an SPF record for your domain with the IP address of the device or application to ensure that recipients do not reject mail sent from it.
https://productforums.google.com/forum/#!topic/gmail/AWKGVG4uoY4
I checked the Gmail SMTP server by using telnet and found that the smtp.gmail.com port 365 did not respond but port 587 did. does it mean that Gmail SMTP server now only support port 587, not support …
https://support.google.com/a/answer/2520500?hl=en
Transport Layer Security (TLS) is a security protocol that encrypts email to protect its privacy. TLS is the successor to Secure Sockets Layer (SSL). Gmail uses TLS by default, but when a secure connection isn't available (both sender and recipient need to use TLS to create a secure connection), Gmail will deliver messages over non-secure connections.
https://pepipost.com/blog/secure-smtp-email-delivery-ssl-tls/
Jan 12, 2018 · Previously, most of the public and free servers did not support TLS but it’s not like that now. For example, Gmail’s 85%+ mail traffic is e-mail encrypted. It requires configuring the email servers with valid SSL certification to configure them with SMTP TLS.
https://www.digicert.com/ssl-support/gmail-pop3-troubleshooting.htm
This would cause Gmail to not trust your certificate because it cannot access the root certificate at the end of the chain. The root certificate is what validates your SSL Certificate’s identity. To fix this issue, you need to install your intermediate certificate (s) to your server.
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