Add-on for all os commerce version 3.0 and below.
Add-on allows for e-mail queuing send from administrative panel, which allows for mass mailing to all customers without the risk of blocking the e-mail which happens particularly often in stores with a large customer base.
Add-on requires CRON module for server (most servers has it installed). Add-on installer should check the way CRON calls files and adjust the cron.php file (which is in package) to server’s requirements.
CRON should be set to run the PHP file every 5 to 15 min, Add-on sends 20 e-mail waiting to be send at every launch of PHP file.