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The best way to understand what a hook does is to look at where it occurs in the source code.
do_action( "hook_name" )apply_filters( "hook_name", "what_to_filter" ).Remember, this hook may occur in more than one file. Moreover, the hook's context may change from version to version.
| Line | Code | 
|---|---|
| 207 |  * @param string|array $to Array or comma-separated list of email addresses to send message. | 
| 208 |  * @param string $subject Email subject | 
| 209 |  * @param string $message Message contents | 
| 210 |  * @param string|array $headers Optional. Additional headers. | 
| 211 |  * @param string|array $attachments Optional. Files to attach. | 
| 212 |  * @return bool Whether the email contents were sent successfully. | 
| 213 |  */ | 
| 214 | function wp_mail( $to, $subject, $message, $headers = '', $attachments = array() ) { | 
| 215 |      // Compact the input, apply the filters, and extract them back out | 
| 216 |      extract( apply_filters( 'wp_mail', compact( 'to', 'subject', 'message', 'headers', 'attachments' ) ) ); | 
| 217 |  | 
| 218 |      if ( !is_array($attachments) ) | 
| 219 |           $attachments = explode( "\n", str_replace( "\r\n", "\n", $attachments ) ); | 
| 220 |  | 
| 221 |      global $phpmailer; | 
| 222 |  | 
| 223 |      // (Re)create it, if it's gone missing | 
| 224 |      if ( !is_object( $phpmailer ) || !is_a( $phpmailer, 'PHPMailer' ) ) { | 
| 225 |           require_once ABSPATH . WPINC . '/class-phpmailer.php'; |