diff --git a/api/api_functions.php b/api/api_functions.php
index e7254ca..abb5ace 100644
--- a/api/api_functions.php
+++ b/api/api_functions.php
@@ -279,4 +279,38 @@ function add_or_renew_membership($user_id, $purchased=NULL) {
         new InsideDatabaseException($res->getMessage().". DEBUG: ".$res->getDebugInfo());
     }
 
+}
+
+/* The purpose of this email is to
+    - Give a positive confirmation after a membership purchase
+    - Link to our webpage
+*/
+function send_membership_confirmation_mail($user, $first_user_membership) {
+    $from_email = "medlemskap@studentersamfundet.no";
+    $sendto = $user['email'];
+    $subject = "Velkommen tilbake Det Norske Studentersamfund";
+    if($first_user_membership) {
+        $subject = "Velkommen til Det Norske Studentersamfund";
+    }
+
+    $headers = "From: $from_email\r\n";
+    $headers .= "Reply-To: $from_email\r\n";
+    $headers .= "MIME-Version: 1.0\r\n";
+    $headers .= "Content-Type: text/html; charset=UTF-8\r\n";
+
+    $inside_url = "https://inside.studentersamfundet.no/";
+
+    $message = '<html><body>';
+    if($first_user_membership) {
+        $message .= '<h3>Gratulerer med ditt nye medlemskap i Det Norske Studentersamfund!</h3>';
+        $message .= '<p>Du kan lese mer om hvilke fordeler medlemskapet ditt gir p&aring; <a href="https://studentersamfundet.no/bli-medlem/">studentersamfundet.no</a>.</p>';
+    } else {
+        $message .= '<h3>Medlemskapet ditt i Det Norske Studentersamfund er fornyet!</h3>';
+    }
+    $message .= '<p style="margin-bottom: 20px;">Medlemskapet varer helt til '.$user['expires'].' Trykk p&aring; lenken under for &aring; logge inn og se medlemskapet ditt.</p>';
+    $message .= '<p style="margin-bottom: 20px;"><a href="'.$inside_url.'" style="font-family: Arial,sans-serif; color: white; font-weight: bold; font-size: 20px; padding: 0.8em 1.2em; border: none; text-decoration: none; background-color: #58AA58; display: inline-block; text-align: center; margin: 0;">Logg inn</a></p>';
+    $message .= "<p>Med vennlig hilsen<br>Det Norske Studentersamfund</p>";
+    $message .= "</body></html>";
+
+    @mail($sendto, $subject, $message, $headers);
 }
\ No newline at end of file
diff --git a/api/membership.php b/api/membership.php
index a4676da..a2cefd3 100644
--- a/api/membership.php
+++ b/api/membership.php
@@ -64,7 +64,7 @@ if( $user['membership_status'] !== 0 ) {
     }
     return_json_response(array('error' => 'Cannot renew, user with phone '.$user['id'].' has a valid membership until: '.$user['expires']), 409);
 }
-// TODO: existing membership or new membership?
+$first_user_membership = $user['expires'] === '0000-00-00';
 
 /* Validate optional purchase_date */
 $purchased = NULL;
@@ -97,7 +97,7 @@ try {
     return_json_response(array('error' => 'db_error', 'error_message' => $e->getMessage()), 500);
 }
 
-// TODO: send new membership or renewal email
+send_membership_confirmation_mail($user, $first_user_membership);
 
 /* Return encrypted user object */
 return_json_response($user);