The Develop phase is hosted in your deevop development server and the Demo and Production phases in your production server. For this reason Develop is treated separately regarding email sending.
During the site development, it is not recommended to allow your CMS to send emails normally. Doing some tests you could send an email to actual users, and this is in general something to be avoided.
In deevop, the procedure for Develop to send Emails depends on your type of account.
Email sending via PHPmail or sendmail is disabled server wide for Starter accounts. In Joomla sites we also disable the "Send Mail" setting under Global Configuration.
In order to have your website send emails in Develop, you need to configure SMTP sending.
Emails sent in Develop via PHPmail or sendmail are captured by the MailCatcher.
Please, contact support to activate this feature.