Send e-mail notificacion ( including attached files ) after user send information with Guest Entries I´m using Guest Entries to add to db some info filled by users, including some attach files. Everything works great.

But now i have to send an email with all the info and files that user send, i´m already using Postmaster plugin to send a notificacion, it works, but it doesn´t send the attached files ( i mean, i don´t know how to do it ).

Is there a way to do this with the plugin or another way?

Thanks for your help.
Instead of using the Postmaster plugin, which appears abandoned and hasn't been updated since 2016, you could write a simple plugin that listened to the afterSaveEntry event.

That plugin could grab any info from the submitted Entry model, including uploads/attachments, and manually compose and send an email out.

You can see an example of how to do that in code in the Contact Form plugin.