(self, opt)
return opt.lower() in self.esmtp_features
Does the server support a given SMTP service extension?
Does the server support a given SMTP service extension?
Does the server support a given SMTP service extension?
def has_extn(self, opt):
        """Does the server support a given SMTP service extension?"""
        return opt.lower() in self.esmtp_features
def has_extn ( self , opt ) : return opt . lower ( ) in self . esmtp_features