This suggests you're sending using the default transport, which uses PHP's mail()
function, which in turn requires that you have a sendmail
binary installed on your local machine. If you don't have one, it can't work and will give you this error. Alternatively you may have one installed but in a different location, in which case you ned to update your php.ini file to point at it (see sendmail_path
) You need to either install a mail server such as postfix, or switch to the SMTP transport and use a remote server.