We strongly recommend to setup a cronjob for each WP Mailster installation to ensure a timely delivery of the mailing list messages.

If this is not done, there might be significant delays in the email delivery.

Why is that?

WP Mailster is a part of WordPress, which is a PHP-based web application. That means: it can not act/run without being triggered, and it can not run forever when triggered. This is a technical limitation coming from PHP, not from WP Mailster or WordPress.

Triggering means that somebody accesses the site. During the page load, WP Mailster is handling the jobs to do (mail retrieving/sending). Thus, mails can only be sent/retrieved when somebody is browsing your site, otherwise, the delivery is delayed or never done. As your site might not be browsed every few minutes 24/7, we recommend you to use a cronjob that opens the site periodically (e.g., by a command-line tool like wget).

If this is a problem in your server environment, you can have us host your cronjob with one of the following services. Many of our product lines already include 1 year of cronjob service. If you run more sites or need a more frequent cronjob to ensure a timely delivery, also with large lists you can purchase more cronjob services below.