[Plugin: Fast and Secure Contact Form] not receiving emails after 3.0 upgrade

The form was working fine. Then I upgraded to 3.0 and I get an error the site that says “the email could not be sent”. I have tried with and w/o an email in the optional “from” section. This is the error I get when I try to send a test email to a gmail account or an account on my domain:

The result was:
bool(false)
The full debugging output is shown below:
object(PHPMailer)#44 (45) {
[“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(28) “[email protected]”
[“FromName”]=>
string(9) “WordPress”
[“Sender”]=>
string(0) “”
[“Subject”]=>
string(31) “Test mail to [email protected]”
[“Body”]=>
string(83) “This is a test mail generated by the Fast and Secure Contact Form WordPress plugin.”
[“AltBody”]=>
string(0) “”
[“WordWrap”]=>
int(0)
[“Mailer”]=>
string(4) “mail”
[“Sendmail”]=>
string(18) “/usr/sbin/sendmail”
[“PluginDir”]=>
string(0) “”
[“Version”]=>
string(5) “2.0.4”
[“ConfirmReadingTo”]=>
string(0) “”
[“Hostname”]=>
string(0) “”
[“MessageID”]=>
string(0) “”
[“Host”]=>
string(9) “localhost”
[“Port”]=>
int(25)
[“Helo”]=>
string(0) “”
[“SMTPSecure”]=>
string(0) “”
[“SMTPAuth”]=>
bool(false)
[“Username”]=>
string(0) “”
[“Password”]=>
string(0) “”
[“Timeout”]=>
int(10)
[“SMTPDebug”]=>
int(2)
[“SMTPKeepAlive”]=>
bool(false)
[“SingleTo”]=>
bool(false)
[“smtp”]=>
NULL
[“to”]=>
array(1) {
[0]=>
array(2) {
[0]=>
string(18) “[email protected]”
[1]=>
string(0) “”
}
}
[“cc”]=>
array(0) {
}
[“bcc”]=>
array(0) {
}
[“ReplyTo”]=>
array(0) {
}
[“attachment”]=>
array(0) {
}
[“CustomHeader”]=>
array(0) {
}
[“message_type”]=>
string(5) “plain”
[“boundary”]=>
array(2) {
[1]=>
string(35) “b1_f90a4fd19e2af97b9e7f49368bcdda71”
[2]=>
string(35) “b2_f90a4fd19e2af97b9e7f49368bcdda71”
}
[“language”]=>
array(13) {
[“mailer_not_supported”]=>
string(25) ” mailer is not supported.”
[“provide_address”]=>
string(55) “You must provide at least one mailer is not supported.”
[“execute”]=>
string(19) “Could not execute: “
[“instantiate”]=>
string(36) “Could not instantiate mail function.”
[“authenticate”]=>
string(35) “SMTP Error: Could not authenticate.”
[“from_failed”]=>
string(35) “The following From address failed: “
[“data_not_accepted”]=>
string(30) “SMTP Error: Data not accepted.”
[“recipients_failed”]=>
string(56) “SMTP Error: The following SMTP Error: Data not accepted.”
[“connect_host”]=>
string(43) “SMTP Error: Could not connect to SMTP host.”
[“file_access”]=>
string(23) “Could not access file: “
[“file_open”]=>
string(33) “File Error: Could not open file: “
[“encoding”]=>
string(18) “Unknown encoding: “
[“signing”]=>
string(15) “Signing Error: “
}
[“error_count”]=>
int(1)
[“LE”]=>
string(1) “
“
[“sign_cert_file”]=>
string(0) “”
[“sign_key_file”]=>
string(0) “”
[“sign_key_pass”]=>
string(0) “”
}