Fail after update

The WP Mail SMTP has worked faultlessly for me for ages – until the update I installed yesterday!!. My Woo emails are not firing and I get this error on test:

I have replaced my password with ********* – I’m not sure why it has to be in the clear anyway!
Test Message Sent

The result was:

bool(false)
The full debugging output is shown below:

PHPMailer Object
(
[Version] => 5.2.22
[Priority] =>
[CharSet] => UTF-8
[ContentType] => text/plain
[Encoding] => 7bit
[ErrorInfo] => SMTP Error: The following recipients failed: [email protected]: Error: too many recipients from 91.208.99.2

[From] => [email protected]
[FromName] => Painted by You
[Sender] => [email protected]
[ReturnPath] =>
[Subject] => WP Mail SMTP: Test mail to [email protected]
[Body] => This is a test email generated by the WP Mail SMTP WordPress plugin.
[AltBody] =>
[Ical] =>
[MIMEBody:protected] => This is a test email generated by the WP Mail SMTP WordPress plugin.

[MIMEHeader:protected] => Date: Mon, 6 Nov 2017 10:43:14 +0000
To: [email protected]
From: Painted by You
Subject: WP Mail SMTP: Test mail to [email protected]
Message-ID: <[email protected]>
X-Mailer: PHPMailer 5.2.22 (https://github.com/PHPMailer/PHPMailer)
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8

[mailHeader:protected] =>
[WordWrap] => 0
[Mailer] => smtp
[Sendmail] => /usr/sbin/sendmail
[UseSendmailOptions] => 1
[PluginDir] =>
[ConfirmReadingTo] =>
[Hostname] =>
[MessageID] =>
[MessageDate] => Mon, 6 Nov 2017 10:43:14 +0000
[Host] => mail3.gridhost.co.uk
[Port] => 465
[Helo] =>
[SMTPSecure] => ssl
[SMTPAutoTLS] => 1
[SMTPAuth] => 1
[SMTPOptions] => Array
(
)

[Username] => [email protected]
[Password] => **********
[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] => 221 2.0.0 Bye

)

[to:protected] => Array
(
[0] => Array
(
[0] => [email protected]
[1] =>
)

)

[cc:protected] => Array
(
)

[bcc:protected] => Array
(
)

[ReplyTo:protected] => Array
(
)

[all_recipients:protected] => Array
(
[[email protected]] => 1
)

[RecipientsQueue:protected] => Array
(
)

[ReplyToQueue:protected] => Array
(
)

[attachment:protected] => Array
(
)

[CustomHeader:protected] => Array
(
)

[lastMessageID:protected] => <[email protected]>
[message_type:protected] => plain
[boundary:protected] => Array
(
[1] => b1_01e4b575c3fa08fef229091d7fc65456
[2] => b2_01e4b575c3fa08fef229091d7fc65456
[3] => b3_01e4b575c3fa08fef229091d7fc65456
)

[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] => 01e4b575c3fa08fef229091d7fc65456
)
The SMTP debugging output is shown below:

Dismiss this notice.
From Email
[email protected]
You can specify the email address that emails should be sent from. If you leave this blank, the default email will be used.
From Name
Painted by You
You can specify the name that emails should be sent from. If you leave this blank, the emails will be sent from WordPress.
Mailer Mailer
Send all WordPress emails via SMTP.
Use the PHP mail() function to send emails.
Return Path Return Path Set the return-path to match the From Email
Return Path indicates where non-delivery receipts – or bounce messages – are to be sent.
Save Changes
SMTP Options

These options only apply if you have chosen to send mail by SMTP above.

SMTP Host
mail3.gridhost.co.uk
SMTP Port
465
Encryption Encryption No encryption.
Use SSL encryption.
Use TLS encryption.
TLS is not the same as STARTTLS. For most servers SSL is the recommended option.
Authentication Authentication No: Do not use SMTP authentication.
Yes: Use SMTP authentication.
If this is set to ‘no’, the values below are ignored.
Username
[email protected]
Password
***********
This is in plain text because it must not be stored encrypted.
Save Changes
Send a Test Email

To
Type an email address here and then click Send Test to generate a test email.
Send Test