Starts a mail transaction from the email address specified in $from. Returns true if successful or false otherwise. If True the mail transaction is started and then one or more recipient commands may be called followed by a data command.Implements RFC 821: MAIL <SP> FROM:<reverse-path> <CRLF> and two extensions, namely XVERP and SMTPUTF8. The server's EHLO response is not checked. If use of either extensions is enabled even though the server does not support that, mail submission will fail. XVERP is documented at <a href="https://www.postfix.org/VERP_README.html">https://www.postfix.org/VERP_README.html</a> and SMTPUTF8 is specified in RFC 6531.
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