The result was:
bool(false)
The full debugging output is shown below:
object(PHPMailer)#5601 (73) {
  ["Version"]=>
  string(6) "5.2.10"
  ["Priority"]=>
  int(3)
  ["CharSet"]=>
  string(5) "UTF-8"
  ["ContentType"]=>
  string(10) "text/plain"
  ["Encoding"]=>
  string(4) "8bit"
  ["ErrorInfo"]=>
  string(36) "Could not instantiate mail function."
  ["From"]=>
  string(17) "info@bloobrand.es"
  ["FromName"]=>
  string(9) "Bloobrand"
  ["Sender"]=>
  string(0) ""
  ["ReturnPath"]=>
  string(0) ""
  ["Subject"]=>
  string(51) "WP Mail SMTP: Test mail to david.randulfe@gmail.com"
  ["Body"]=>
  string(68) "This is a test email generated by the WP Mail SMTP WordPress plugin."
  ["AltBody"]=>
  string(0) ""
  ["Ical"]=>
  string(0) ""
  ["MIMEBody":protected]=>
  string(69) "This is a test email generated by the WP Mail SMTP WordPress plugin.
"
  ["MIMEHeader":protected]=>
  string(307) "Date: Sat, 26 Dec 2015 19:00:11 +0000
From: Bloobrand
Message-ID:
X-Priority: 3
X-Mailer: PHPMailer 5.2.10 (https://github.com/PHPMailer/PHPMailer/)
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit
"
  ["mailHeader":protected]=>
  string(0) ""
  ["WordWrap"]=>
  int(0)
  ["Mailer"]=>
  string(4) "mail"
  ["Sendmail"]=>
  string(18) "/usr/sbin/sendmail"
  ["UseSendmailOptions"]=>
  bool(true)
  ["PluginDir"]=>
  string(0) ""
  ["ConfirmReadingTo"]=>
  string(0) ""
  ["Hostname"]=>
  string(0) ""
  ["MessageID"]=>
  string(0) ""
  ["MessageDate"]=>
  string(31) "Sat, 26 Dec 2015 19:00:11 +0000"
  ["Host"]=>
  string(9) "localhost"
  ["Port"]=>
  int(25)
  ["Helo"]=>
  string(0) ""
  ["SMTPSecure"]=>
  string(0) ""
  ["SMTPAutoTLS"]=>
  bool(true)
  ["SMTPAuth"]=>
  bool(false)
  ["SMTPOptions"]=>
  array(0) {
  }
  ["Username"]=>
  string(0) ""
  ["Password"]=>
  string(0) ""
  ["AuthType"]=>
  string(0) ""
  ["Realm"]=>
  string(0) ""
  ["Workstation"]=>
  string(0) ""
  ["Timeout"]=>
  int(300)
  ["SMTPDebug"]=>
  bool(true)
  ["Debugoutput"]=>
  string(4) "echo"
  ["SMTPKeepAlive"]=>
  bool(false)
  ["SingleTo"]=>
  bool(false)
  ["SingleToArray"]=>
  array(0) {
  }
  ["do_verp"]=>
  bool(false)
  ["AllowEmpty"]=>
  bool(false)
  ["LE"]=>
  string(1) "
"
  ["DKIM_selector"]=>
  string(0) ""
  ["DKIM_identity"]=>
  string(0) ""
  ["DKIM_passphrase"]=>
  string(0) ""
  ["DKIM_domain"]=>
  string(0) ""
  ["DKIM_private"]=>
  string(0) ""
  ["action_function"]=>
  string(0) ""
  ["XMailer"]=>
  string(0) ""
  ["smtp":protected]=>
  NULL
  ["to":protected]=>
  array(1) {
    [0]=>
    array(2) {
      [0]=>
      string(24) "david.randulfe@gmail.com"
      [1]=>
      string(0) ""
    }
  }
  ["cc":protected]=>
  array(0) {
  }
  ["bcc":protected]=>
  array(0) {
  }
  ["ReplyTo":protected]=>
  array(0) {
  }
  ["all_recipients":protected]=>
  array(1) {
    ["david.randulfe@gmail.com"]=>
    bool(true)
  }
  ["attachment":protected]=>
  array(0) {
  }
  ["CustomHeader":protected]=>
  array(0) {
  }
  ["lastMessageID":protected]=>
  string(47) ""
  ["message_type":protected]=>
  string(5) "plain"
  ["boundary":protected]=>
  array(3) {
    [1]=>
    string(35) "b1_c0aed4fec5f14da9676070ad2ca5a170"
    [2]=>
    string(35) "b2_c0aed4fec5f14da9676070ad2ca5a170"
    [3]=>
    string(35) "b3_c0aed4fec5f14da9676070ad2ca5a170"
  }
  ["language":protected]=>
  array(19) {
    ["authenticate"]=>
    string(35) "SMTP Error: Could not authenticate."
    ["connect_host"]=>
    string(43) "SMTP Error: Could not connect to SMTP host."
    ["data_not_accepted"]=>
    string(30) "SMTP Error: data not accepted."
    ["empty_message"]=>
    string(18) "Message body empty"
    ["encoding"]=>
    string(18) "Unknown encoding: "
    ["execute"]=>
    string(19) "Could not execute: "
    ["file_access"]=>
    string(23) "Could not access file: "
    ["file_open"]=>
    string(33) "File Error: Could not open file: "
    ["from_failed"]=>
    string(35) "The following From address failed: "
    ["instantiate"]=>
    string(36) "Could not instantiate mail function."
    ["invalid_address"]=>
    string(15) "Invalid address"
    ["mailer_not_supported"]=>
    string(25) " mailer is not supported."
    ["provide_address"]=>
    string(54) "You must provide at least one recipient email address."
    ["recipients_failed"]=>
    string(45) "SMTP Error: The following recipients failed: "
    ["signing"]=>
    string(15) "Signing Error: "
    ["smtp_connect_failed"]=>
    string(22) "SMTP connect() failed."
    ["smtp_error"]=>
    string(19) "SMTP server error: "
    ["variable_set"]=>
    string(30) "Cannot set or reset variable: "
    ["extension_missing"]=>
    string(19) "Extension missing: "
  }
  ["error_count":protected]=>
  int(2)
  ["sign_cert_file":protected]=>
  string(0) ""
  ["sign_key_file":protected]=>
  string(0) ""
  ["sign_extracerts_file":protected]=>
  string(0) ""
  ["sign_key_pass":protected]=>
  string(0) ""
  ["exceptions":protected]=>
  bool(true)
  ["uniqueid":protected]=>
  string(32) "c0aed4fec5f14da9676070ad2ca5a170"
}
The SMTP debugging output is shown below:
2015-12-26 19:00:11	Could not instantiate mail function.