Delivery servers are needed in order to send out all the emails from the application. Even if it’s about sending a confirmation email, an email campaign, a test email, you need a delivery server to actually make the delivery.
MailWizz comes with support for any SMTP server out there, PHP’s built-in mail function and sendmail. Also it integrates with services like Sparkpost, MailGun, Amazon SES, SendGrid, ElasticEmail, NewsMan and much more in order to make sure you are not limited into using just a single service but you have a wide array of options. You can use either of them, or all of them together. MailWizz gives you total flexibility for this.