Magento gmail new order email is not sending

It is weird situation that new order email is not sending properly from magento shopping cart.

I have used sendgrid for mail sending most of case and never know about the queuing mechanism at Magento at all.

And this this I was using the SMTP Pro Email Extension that has Queue configuration that was bother to send email through gmail smtp server.

All you have to do is System ->configuration -> SMTP Pro and select the “Queue Usage” as “Never” as below image;

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