How to send email using sendmail (postfix) on debian 9 using php mail

Hi! I have a stupid question. I need to send custom html form thrue php using SMTP on DO droplet hosted my site. So I installed sendmail open 25 port on ufw testing but nothing. Weird…Ok I’ve installed postfix, configured it, open 25 port on ufw testing…and nothing…

Nothing, I mean even in /var/log/ empty

Now I’m del all mail software to reinstall it with your instructions on site and also have no luck…

So Ok question: How can I send email from SMTP on DO using php mail() function?

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Ok I found solution. Use msmtp and my hosting smtp server.