Index: bp-core/bp-core-filters.php
===================================================================
--- bp-core/bp-core-filters.php	(revision 5114)
+++ bp-core/bp-core-filters.php	(working copy)
@@ -52,7 +52,7 @@
 function bp_core_email_from_address_filter() {
 	$domain = (array) explode( '/', site_url() );

-	return apply_filters( 'bp_core_email_from_address_filter', __( 'noreply', 'buddypress' ) . '@' . $domain[2] );
+	return apply_filters( 'bp_core_email_from_address_filter', _x( 'noreply', 'email address part before @domain.com', 'buddypress' ) . '@' . $domain[2] );
 }
 add_filter( 'wp_mail_from', 'bp_core_email_from_address_filter' );