Initial commit

vendor/github.com/emersion/go-smtp/backend.go

@@ -0,0 +1,19 @@
+package smtp
+
+import (
+	"io"
+)
+
+// A SMTP server backend.
+type Backend interface {
+	// Authenticate a user.
+	Login(username, password string) (User, error)
+}
+
+// An authenticated user.
+type User interface {
+	// Send an e-mail.
+	Send(from string, to []string, r io.Reader) error
+	// Logout is called when this User will no longer be used.
+	Logout() error
+}