SMTP over SSL is not supported on the MP 6001. There is no firmware update as it is the processor that does not support it. You have to use a port 25 option. If you are a registered G Suite user you can use the G Suite Relay. Otherwise you will have to use the Restricted Gmail SMTP server. For more information read this Google support document. https://support.google.com/a/answer/176600?hl=en
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