diff --git a/mailgun.go b/mailgun.go
index ebba3eb..a11927c 100644
--- a/mailgun.go
+++ b/mailgun.go
@@ -78,7 +78,6 @@ import (
 	"context"
 	"errors"
 	"fmt"
-	"io"
 	"net/http"
 	"os"
 	"sync"
@@ -144,8 +143,6 @@ type Mailgun interface {
 	// TODO(v5): switch m to SendableMessage interface
 	Send(ctx context.Context, m *Message) (mes string, id string, err error)
 	ReSend(ctx context.Context, id string, recipients ...string) (string, string, error)
-	// Deprecated: use func NewMIMEMessage instead of method.
-	NewMIMEMessage(body io.ReadCloser, to ...string) *Message
 
 	ListBounces(opts *ListOptions) *BouncesIterator
 	GetBounce(ctx context.Context, address string) (Bounce, error)
diff --git a/messages.go b/messages.go
index bb53032..c68bcf1 100644
--- a/messages.go
+++ b/messages.go
@@ -229,13 +229,6 @@ func NewMIMEMessage(body io.ReadCloser, to ...string) *Message {
 	}
 }
 
-// Deprecated: use func NewMIMEMessage instead of method.
-//
-// TODO(v5): remove this method
-func (*MailgunImpl) NewMIMEMessage(body io.ReadCloser, to ...string) *Message {
-	return NewMIMEMessage(body, to...)
-}
-
 func (m *Message) Domain() string {
 	return m.domain
 }