Hi there Kevin,
I really appreciate you chipping in - I will take any quick hot takes I can get!
I’m so grateful for the help I’ve received here.
I got an email from our host last night saying that as long as the website uses basic PHP mail or SMTP, it should be fine - which is precisely what you said too Kevin.
The host also said that as long as the SMTP is not used with “the SSL or TLS option”, we should be fine.
I have checked the email.php file that Raul mentioned above, and I can’t see any mention of SSL or TLS, so I’m really hoping that everything is ok.
I have included a copy of the file contents below (with the sensitive stuff removed) - if anyone can spot anything in there that might contradict my assumption that we’re ok, I would be sooo grateful if you can let me know!
Can’t thank you guys enough! 
<?php
/**
*
*
* CakePHP(tm) : Rapid Development Framework (http://cakephp.org)
* Copyright (c) Cake Software Foundation, Inc. (http://cakefoundation.org)
*
* Licensed under The MIT License
* For full copyright and license information, please see the LICENSE.txt
* Redistributions of files must retain the above copyright notice.
*
* @copyright Copyright (c) Cake Software Foundation, Inc. (http://cakefoundation.org)
* @link http://cakephp.org CakePHP(tm) Project
* @package app.Config
* @since CakePHP(tm) v 2.0.0
* @license http://www.opensource.org/licenses/mit-license.php MIT License
*/
/**
* This is email configuration file.
*
* Use it to configure email transports of CakePHP.
*
* Email configuration class.
* You can specify multiple configurations for production, development and testing.
*
* transport => The name of a supported transport; valid options are as follows:
* Mail - Send using PHP mail function
* Smtp - Send using SMTP
* Debug - Do not send the email, just return the result
*
* You can add custom transports (or override existing transports) by adding the
* appropriate file to app/Network/Email. Transports should be named 'YourTransport.php',
* where 'Your' is the name of the transport.
*
* from =>
* The origin email. See CakeEmail::from() about the valid values
*
*/
class EmailConfig {
public $test = array(
'transport' => 'Debug',
//'log' => true
);
public $default = array(
'transport' => 'Mail',
'from' => 'you@localhost',
//'charset' => 'utf-8',
//'headerCharset' => 'utf-8',
);
/* public $smtp = array(
'transport' => 'Smtp',
'from' => array('[. ]@[. ].co.uk' => '[. ]'),
'host' => 'send.one.com',
'port' => 465,
'timeout' => 30,
'username' => '[ ]@[ ] ',
'password' => '[ ]',
'client' => null,
'log' => false,
//'charset' => 'utf-8',
//'headerCharset' => 'utf-8',
); */
public $smtp = array(
'transport' => 'Smtp',
'from' => array('[ ]@[ ] ' => '[ ]'),
'host' => 'send.one.com',
'port' => 465,
'timeout' => 30,
'username' => '[ ]@[ ]',
'password' => '[ ]',
'client' => null,
'log' => false,
//'charset' => 'utf-8',
//'headerCharset' => 'utf-8',
);
public $fast = array(
'from' => 'you@localhost',
'sender' => null,
'to' => null,
'cc' => null,
'bcc' => null,
'replyTo' => null,
'readReceipt' => null,
'returnPath' => null,
'messageId' => true,
'subject' => null,
'message' => null,
'headers' => null,
'viewRender' => null,
'template' => false,
'layout' => false,
'viewVars' => null,
'attachments' => null,
'emailFormat' => null,
'transport' => 'Smtp',
'host' => 'localhost',
'port' => 25,
'timeout' => 30,
'username' => 'user',
'password' => '[. ]',
'client' => null,
'log' => true,
//'charset' => 'utf-8',
//'headerCharset' => 'utf-8',
);
}