After Mandrill stopped their free service, I and many others have since moved to mailgun. They offer a near identical service and it would be great if there could be a plugin to link in with their API so that “Bounced” addresses are also tracked.
My apologies, I should have been more specific. The plugin for mailgun seems to append the registered mailgun custom domain to every outgoing email. This domain is fully connfigured and operational with mailgun outside of the plugin. For example
Send to firstname.lastname@example.org in Mailgun testing screen. The request received by mailgun API is for email@example.com@mailguncustomdomain.com which of course failed and is dropped.
Mails to addresses on the @mailguncustomdomain.com work.