Problem sending e-mails through forms

We are trying to add a contact form to our wordpress website (http://www.******-*****.com) but are receiving an error when sending. The error is - "Could not instantiate mail function" Attached is a full debug of the test. Please could you advise why this is happening and help us to resolve it?
De-bug is below

Test Message Sent
wordpress Test email to info@******-*****.com
The result was:
See FAQ
bool(false)
The full debugging output is shown below:
See FAQ
object(PHPMailer)#12802 (76) {
["Version"]=>
string(6) "5.2.22"
["Priority"]=>
NULL
["CharSet"]=>
string(5) "UTF-8"
["ContentType"]=>
string(9) "text/html"
["Encoding"]=>
string(4) "7bit"
["ErrorInfo"]=>
string(36) "Could not instantiate mail function."
["From"]=>
string(22) "info@******-*****.com"
["FromName"]=>
string(24) "Fast Secure Contact Form"
["Sender"]=>
string(0) ""
["ReturnPath"]=>
string(0) ""
["Subject"]=>
string(36) "Test email to info@******-*****.com"
["Body"]=>
string(80) "This is a test email generated by the Fast Secure Contact Form
WordPress plugin."
["AltBody"]=>
string(0) ""
["Ical"]=>
string(0) ""
["MIMEBody":protected]=>
string(81) "This is a test email generated by the Fast Secure Contact Form
WordPress plugin.
"
["MIMEHeader":protected]=>
string(320) "Date: Thu, 1 Jun 2017 15:49:40 +0000
From: Fast Secure Contact Form
Reply-To: info@******-*****.com
Message-ID: <5e2a055a43d8829704b3252f67537ea6@www.******-*****.com>
X-Mailer: PHPMailer 5.2.22 (https://github.com/PHPMailer/PHPMailer)
MIME-Version: 1.0
Content-Type: text/html; charset=UTF-8
"
["mailHeader":protected]=>
string(73) "To: info@******-*****.com
Subject: Test email to info@******-*****.com
"
["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(30) "Thu, 1 Jun 2017 15:49:40 +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"]=>
int(2)
["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) ""
["DKIM_private_string"]=>
string(0) ""
["action_function"]=>
string(0) ""
["XMailer"]=>
string(0) ""
["smtp":protected]=>
NULL
["to":protected]=>
array(1) {
[0]=>
array(2) {
[0]=>
string(22) "info@******-*****.com"
[1]=>
string(0) ""
}
}
["cc":protected]=>
array(0) {
}
["bcc":protected]=>
array(0) {
}
["ReplyTo":protected]=>
array(1) {
["info@******-*****.com"]=>
array(2) {
[0]=>
string(22) "info@******-*****.com"
[1]=>
string(0) ""
}
}
["all_recipients":protected]=>
array(1) {
["info@******-*****.com"]=>
bool(true)
}
["RecipientsQueue":protected]=>
array(0) {
}
["ReplyToQueue":protected]=>
array(0) {
}
["attachment":protected]=>
array(0) {
}
["CustomHeader":protected]=>
array(0) {
}
["lastMessageID":protected]=>
string(56) "<5e2a055a43d8829704b3252f67537ea6@www.******-*****.com>"
["message_type":protected]=>
string(5) "plain"
["boundary":protected]=>
array(3) {
[1]=>
string(35) "b1_5e2a055a43d8829704b3252f67537ea6"
[2]=>
string(35) "b2_5e2a055a43d8829704b3252f67537ea6"
[3]=>
string(35) "b3_5e2a055a43d8829704b3252f67537ea6"
}
["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(17) "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(1)
["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(false)
["uniqueid":protected]=>
string(32) "5e2a055a43d8829704b3252f67537ea6"
}
The Email debugging output is shown below:
See FAQ
2017-06-01 15:49:40 Could not instantiate mail function.