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In what ways can mail be sent? I am familiar with cron mail and php sending mail, but does a mail MTA such as postfix or sendmail need to be installed on the server? Is php also a mta? What if sendmail/postfix isn't installed?
I'm also curious about how web forms with emails send registration emails out to people. I suppose it could be php's 'mail' function or something else.
1PHP scripts can both use an SMTP server (such as a local MTA) or send the mail directly. It depends on the script. – Dennis – 2013-04-18T21:37:48.587