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

TLS Negotiation failed, the certificate doesn't match the host

GSuite TLS Failed

This is because the G Suite Gmail account have Route configured and the SMTP server configured have no valid SSL.


You can install a valid SSL on your mail server or disable the TLS checking. To disable TLS checking, go to

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

G Suite Edit mail route

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.

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