all mails send vai php mail() go to spam on gmail and yahoo

**Hello Every body now I deployed I project on Ubunto 16.04 LEMP when I use mail() in php any mails send to spam in gmail or yahoo any configure I do to solve this problem thank’s **


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This is usually because mail providers are told you’re not authenticated which is usually an spf record. You can use to see why your emails might be treated as spam and you can work with that to finally resolve your problem.