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When sending an email, the authentication and uploading stages exit successfully. After a long period with the message Connecting to gmail.com, the error message Could not connect to gmail.com (No route to host). occurs and the email is not sent. What causes this error and how might I fix it?

I do have my smtp_url set to port 587 of my stmp account URI.

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That's because there's not opened port tcp/587 (smtp + tls) on gmail.com. You should use smtp.gmail.com.

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