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Path to Sendmail
The path to sendmail on our servers is:
/usr/sbin/sendmail
Some applications may ask for this path during installation or configuration. This is the standard sendmail binary location on our CentOS/AlmaLinux servers and is used by PHP mail function, CGI scripts, and other applications that send email through the server.
PHP mail() Function
PHP's built-in mail() function uses sendmail automatically. You do not need to configure the sendmail path for PHP scripts unless the application specifically asks for it. If a PHP application has a "sendmail path" setting, use /usr/sbin/sendmail.
SMTP Alternative
For better deliverability and tracking, many applications support sending email via SMTP instead of sendmail. If your application offers SMTP as an option, configure it with your email account credentials (mail.yourdomain.com, port 465 SSL, your full email address and password). SMTP email is authenticated and less likely to be flagged as spam.
