Could not instantiate mail function ismail phpmailer php 7.0

A classic issue!

The error "Could not instantiate mail function" usually occurs when PHPMailer is unable to use the default mail function (mail()) to send emails. This can happen for several reasons, especially in PHP 7.0.

Here are some common solutions to resolve this issue:

Check your PHP version: PHPMailer requires PHP 5.5 or later. If you're using PHP 7.0, you should be good to go. However, if you're using an earlier version, you'll need to upgrade.
Verify your mail function: Make sure that the mail() function is enabled in your PHP configuration. You can check this by running the following code:
```
<?php
if (!function_exists('mail')) {
 echo 'mail() function is not enabled';
} else {
 echo 'mail() function is enabled';
}
?>
```
If the output is "mail() function is not enabled", you'll need to enable it in your PHP configuration.
Check your PHPMailer version: Ensure that you're using a compatible version of PHPMailer. You can check the version by running:
```
<?php
echo PHPMailer::VERSION;
?>
```
If you're using an older version, consider upgrading to the latest version (currently 6.5.3).
Check your server configuration: Some servers may have restrictions on sending emails. Check your server's configuration to ensure that it allows sending emails. You can try sending an email using the mail() function directly to test this:
```
<?php
$headers = array('From' => '[email protected]', 'Subject' => 'Test Email');
$message = 'This is a test email';
mail('[email protected]', 'Test Email', $message, $headers);
?>
```
If this code works, it's likely a PHPMailer issue.
Try a different mail transport: PHPMailer supports multiple mail transports, including smtp, sendmail, and mail. You can try switching to a different transport by setting the isSMTP property to false:
```
<?php
$mail = new PHPMailer();
$mail->isSMTP(false);
//... rest of your code...
?>
```
If none of these solutions work, please provide more details about your environment, including your PHP version, PHPMailer version, and server configuration.

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Could not instantiate mail function ismail phpmailer php 7.0