diff --git a/server/plugins-available/mail_plugin.inc.php b/server/plugins-available/mail_plugin.inc.php
index d0bb377089f4ba01296c9a35cf77007989ea95c2..8696205a00c64bfd91224434ef56c14d221590be 100644
--- a/server/plugins-available/mail_plugin.inc.php
+++ b/server/plugins-available/mail_plugin.inc.php
@@ -247,7 +247,7 @@ class mail_plugin {
 			$mailHeaders     .= "Content-Type: text/html; charset=utf-8" . "\n";
 			$mailHeaders     .= "Content-Transfer-Encoding: quoted-printable" . "\n";
 		} else {
-			$mailHeaders     .= "Content-type: text/plain; charset=utf-8" . "\n";
+			$mailHeaders     .= "Content-Type: text/plain; charset=utf-8" . "\n";
 			$mailHeaders     .= "Content-Transfer-Encoding: 8bit" . "\n";
 		}
 		$mailHeaders     .= "From: $welcome_mail_from" . "\n";