Mail not deliverable with error 454 TLS currently unavailable

This issue typically applies to Virtual Private Servers and Dedicated Servers. If email delivery fails with this error message: 454 TLS currently unavailable, it means the mail server is misconfigured. TLS relates to SSL setup for the mail server. This can happen due to expired SSL certificate or improperly configured SSL. Once the SSL is configured correctly, the mail delivery will start working fine. 
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