Wordpress4.9.1 SMTP not working - wordpress

Question

I am using the WP mail SMTP (0.11.2) plugin.
usingWordpress4.9.1
When I sent my email it gives me this error SMTP -> ERROR: Failed to connect to server or Could not authenticate.
How can I fix it?
C:\wamp64\www\wordpress\wp-content\plugins\wp-mail-smtp\wp_mail_smtp.php:258:boolean false
Here is my testmail debuging info:
PHPMailer Object
(
[Version] => 5.2.22
[Priority] =>
[CharSet] => UTF-8
[ContentType] => text/plain
[Encoding] => 8bit
[ErrorInfo] => SMTP connect() failed.
https://github.com/PHPMailer/PHPMailer/wiki/Troubleshooting
[From] => xxxxxxxxxx#gmail.com
[FromName] => 搖滾俱樂部
[Sender] =>
[ReturnPath] =>
[Subject] => WP Mail SMTP: Test mail to bb5566123com#yahoo.com.tw
[Body] => 這封測試郵件由 WordPress 外掛 WP Mail SMTP 自動產生。
[AltBody] =>
[Ical] =>
[MIMEBody:protected] => 這封測試郵件由 WordPress 外掛 WP Mail SMTP 自動產生。
[MIMEHeader:protected] => Date: Fri, 8 Dec 2017 14:51:09 +0000
To: xxxxxxxxx#yahoo.com.tw
From: =?UTF-8?B?5pCW5ru+5L+x5qiC6YOo?=
Subject: WP Mail SMTP: Test mail to bb5566123com#yahoo.com.tw
Message-ID: <1d6e4a91953547c850de852e798ccbba#club3.idv.tw>
X-Mailer: PHPMailer 5.2.22 (https://github.com/PHPMailer/PHPMailer)
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit
[mailHeader:protected] =>
[WordWrap] => 0
[Mailer] => smtp
[Sendmail] => /usr/sbin/sendmail
[UseSendmailOptions] => 1
[PluginDir] =>
[ConfirmReadingTo] =>
[Hostname] =>
[MessageID] =>
[MessageDate] => Fri, 8 Dec 2017 14:51:09 +0000
[Host] => smtp.gmail.com
[Port] => 465
[Helo] =>
[SMTPSecure] => ssl
[SMTPAutoTLS] => 1
[SMTPAuth] => 1
[SMTPOptions] => Array
(
)
[Username] => xxxxxxxxxxx#gmail.com
[Password] => xxxxxxxxxxxx
[AuthType] =>
[Realm] =>
[Workstation] =>
[Timeout] => 300
[SMTPDebug] => 0
[Debugoutput] => echo
[SMTPKeepAlive] =>
[SingleTo] =>
[SingleToArray] => Array
(
)
[do_verp] =>
[AllowEmpty] =>
[LE] =>
[DKIM_selector] =>
[DKIM_identity] =>
[DKIM_passphrase] =>
[DKIM_domain] =>
[DKIM_private] =>
[DKIM_private_string] =>
[action_function] =>
[XMailer] =>
[smtp:protected] => SMTP Object
(
[Version] => 5.2.22
[SMTP_PORT] => 25
[CRLF] =>
[do_debug] => 0
[Debugoutput] => echo
[do_verp] =>
[Timeout] => 300
[Timelimit] => 300
[smtp_transaction_id_patterns:protected] => Array
(
[exim] => /[0-9]{3} OK id=(.*)/
[sendmail] => /[0-9]{3} 2.0.0 (.*) Message/
[postfix] => /[0-9]{3} 2.0.0 Ok: queued as (.*)/
)
[smtp_conn:protected] =>
[error:protected] => Array
(
[error] =>
[detail] =>
[smtp_code] =>
[smtp_code_ex] =>
)
[helo_rply:protected] =>
[server_caps:protected] =>
[last_reply:protected] =>
)
[to:protected] => Array
(
[0] => Array
(
[0] => xxxxxxxxxx#yahoo.com.tw
[1] =>
)
)
[cc:protected] => Array
(
)
[bcc:protected] => Array
(
)
[ReplyTo:protected] => Array
(
)
[all_recipients:protected] => Array
(
[xxxxxxxxxxx#yahoo.com.tw] => 1
)
[RecipientsQueue:protected] => Array
(
)
[ReplyToQueue:protected] => Array
(
)
[attachment:protected] => Array
(
)
[CustomHeader:protected] => Array
(
)
[lastMessageID:protected] => <1d6e4a91953547c850de852e798ccbba#club3.idv.tw>
[message_type:protected] => plain
[boundary:protected] => Array
(
[1] => b1_1d6e4a91953547c850de852e798ccbba
[2] => b2_1d6e4a91953547c850de852e798ccbba
[3] => b3_1d6e4a91953547c850de852e798ccbba
)
[language:protected] => Array
(
[authenticate] => SMTP Error: Could not authenticate.
[connect_host] => SMTP Error: Could not connect to SMTP host.
[data_not_accepted] => SMTP Error: data not accepted.
[empty_message] => Message body empty
[encoding] => Unknown encoding:
[execute] => Could not execute:
[file_access] => Could not access file:
[file_open] => File Error: Could not open file:
[from_failed] => The following From address failed:
[instantiate] => Could not instantiate mail function.
[invalid_address] => Invalid address:
[mailer_not_supported] => mailer is not supported.
[provide_address] => You must provide at least one recipient email address.
[recipients_failed] => SMTP Error: The following recipients failed:
[signing] => Signing Error:
[smtp_connect_failed] => SMTP connect() failed.
[smtp_error] => SMTP server error:
[variable_set] => Cannot set or reset variable:
[extension_missing] => Extension missing:
)
[error_count:protected] => 2
[sign_cert_file:protected] =>
[sign_key_file:protected] =>
[sign_extracerts_file:protected] =>
[sign_key_pass:protected] =>
[exceptions:protected] => 1
[uniqueid:protected] => 1d6e4a91953547c850de852e798ccbba
)
Heading

Answer 1

Connection: opening to ssl://smtp.gmail.com:465, timeout=300, options=array (
)
Connection: Failed to connect to server.
Error number 2. "Error notice: stream_socket_client():
SSL operation failed with code 1. OpenSSL Error messages:
error:14090086:SSL routines:ssl3_get_server_certificate:certificate verify failedConnection: Failed to connect to server.
Error number 2. "Error notice: stream_socket_client(): Failed to enable cryptoConnection: Failed to connect to server.
Error number 2. "Error notice: stream_socket_client(): unable to connect to ssl://smtp.gmail.com:465 (Unknown error)
SMTP ERROR: Failed to connect to server: (0)SMTP connect() failed. https://github.com/PHPMailer/PHPMailer/wiki/Troubleshooting

Answer 2

Try this plugin https://wordpress.org/plugins/blastex and send email without local smtp server !
Probably self signed certificate on smtp server !!!