G Suite TLS Negotiation failed, the certificate doesn’t match the host
When sending email from G Suite email account, email bounce with following error message
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TLS Negotiation failed, the certificate doesn't match the host |
This is because the G Suite Gmail account have Route configured and the SMTP server configured have no valid SSL.
Solution
You can install a valid SSL on your mail server or disable the TLS checking. To disable TLS checking, go to
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G Suite Admin > Apps > G Suite > Gmail > Hosts |
On this page, you will see your routes (remote SMTP servers). Edit the one you are using
You need to disable the check box “Require mail to be transmitted via a secure (TLS) connection (Recommended)”.
It is better get SSL fixed. If your mail server use a differnt SSL, just change server name in that page.