How to set up a web server with the same domain name as my gmail?

My web server has the domain,, and my team and I have set up email through google with the same domain. When I try to send email using php’s mail method to an email address it doesn’t get successfully sent. How can I configure my server/php to not handle email with the same domain name?

If I didn’t explain it well I’m having the issue described here:


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Does it work if you send emails to another domain? If so, what MTA do you use?