diff --git a/pub/fed.go b/pub/fed.go
index 75ad3be..ca37216 100644
--- a/pub/fed.go
+++ b/pub/fed.go
@@ -375,7 +375,9 @@ func (f *federator) PostOutbox(id string) HandlerFunc {
 				return true, err
 			}
 			for _, to := range recipients {
-				f.pool.Do(b, to, f.postToOutbox)
+				f.pool.Do(b, to, func(b []byte, u url.URL) error {
+					return postToOutbox(f.Client, b, u, f.Agent)
+				})
 			}
 		}
 		w.Header().Set("Location", newId.String())
diff --git a/pub/internal.go b/pub/internal.go
index 000aedf..9087e35 100644
--- a/pub/internal.go
+++ b/pub/internal.go
@@ -1,6 +1,7 @@
 package pub
 
 import (
+	"bytes"
 	"encoding/json"
 	"fmt"
 	"github.com/go-fed/activity/streams"
@@ -84,8 +85,26 @@ func dereference(c *http.Client, u url.URL, agent string) ([]byte, error) {
 
 // postToOutbox will attempt to send a POST request to the given URL with the
 // body set to the provided bytes.
-func (f *federator) postToOutbox(b []byte, to url.URL) error {
-	// TODO: Implement
+func postToOutbox(c *http.Client, b []byte, to url.URL, agent string) error {
+	byteCopy := make([]byte, 0, len(b))
+	copy(b, byteCopy)
+	buf := bytes.NewBuffer(byteCopy)
+	req, err := http.NewRequest("POST", to.String(), buf)
+	if err != nil {
+		return err
+	}
+	req.Header.Add(contentTypeHeader, postContentTypeHeader)
+	req.Header.Add("Accept-Charset", "utf-8")
+	req.Header.Add("Date", time.Now().UTC().Format("Mon, 02 Jan 2006 15:04:05")+" GMT")
+	req.Header.Add("User-Agent", fmt.Sprintf("%s (go-fed ActivityPub)", agent))
+	resp, err := c.Do(req)
+	if err != nil {
+		return err
+	}
+	defer resp.Body.Close()
+	if resp.StatusCode != http.StatusOK {
+		return fmt.Errorf("Request to %s failed (%d): %s", to.String(), resp.StatusCode, resp.Status)
+	}
 	return nil
 }