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並前往https://askubuntu.com/questions/507514/postfix-using-gmail-relay-must-issue-a-starttls-command-first

Postfix Using Gmail Relay: Must issue a STARTTLS command ...

I get this error: Must issue a STARTTLS command first with all sent mail. Can anyone see why? main.cf: relayhost=[smtp.gmail.com]:587 ...

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