* @param MailAddress|MailAddress[] $to Recipient's email (or an array of them)
* @param MailAddress $from Sender's email
* @param string $subject Email's subject.
- * @param string $body Email's text or Array of two strings to be the text and html bodies
+ * @param string|string[] $body Email's text or Array of two strings to be the text and html bodies
* @param array $options Keys:
* 'replyTo' MailAddress
* 'contentType' string default 'text/plain; charset=UTF-8'
* @param MailAddress[] $to Array of recipients' email addresses
* @param MailAddress $from Sender's email
* @param string $subject Email's subject.
- * @param string $body Email's text or Array of two strings to be the text and html bodies
+ * @param string|string[] $body Email's text or Array of two strings to be the text and html bodies
* @param array $options Keys:
* 'replyTo' MailAddress
* 'contentType' string default 'text/plain; charset=UTF-8'