opensmtpd php_mail /usr/sbin/sendmail

[lilit-aibolit]

Hello misc.
There are many web applications that used php_mail function,
which points to /usr/sbin/sendmail on localhost.
In some case sendmail used with smart_host+masquerade options
to deliver email via gmail for example.
Configure sendmail to work with gmail (SMTP AUTH/TLS) is hard for me.
The question: it is possible to use opensmtpd instead sendmail to
compose email from php_mail function?
and how point web-application to opensmtpd?