Joomla supports sending email over SMTP. This method is also a good way to resolve the “could not instantiate mail function error” that’s common with php mail() function used to send emails . Be sure to test your site and ensure emails are being sent properly.
If you are using Pepipost as an email service provider, the best way to send emails from your Joomla site is to configure the SMTP settings in the Global Configurations area. If setup correctly, you will have a reliable email functionality for your Joomla site.
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To have Joomla relay email through Pepipost, go to your Joomla installation, Site > Global Configuration
Enter the following details: