Shows how to obverride the Participants Database email session limit

pdb-override-email-limit.php

<?php
/**
 * Plugin Name: PDB Override Email Limit
 * Description: sets a new outgoing email limit
 * Version: 1.0
 */

// overrides the session email limit with a new limit
add_action( 'pdb-mass_email_session_limit', function($limit){
  $limit = 500; // this is your new limit
  return $limit;
} );

Alternatively, the action handler shown here can be added to your theme functions.php file.

WARNING: This does not guarantee that the number of emails you set here will go out! This only overrides the session limit that Participants Databases uses. The number of emails that can be sent is limited by several things: the complexity of the email itself, and the speed and configuration of your web server.

What will happen if you try to send too many emails is the process will hang when the php time limit is reached, and you may not know what emails went out or not. An email log can help with this.

Also be warned that sending out a mass email can get you in trouble with your hosting provider, especially on shared hosting. Most shared hosting does not allow mass email sends.

Note that Participants Database is not a mass email platform, it is not designed for that purpose and cannot support a large number of email sends.