Commit notification emails lists undisclosed recipients in To: field.
Our notifications show up as:
Message-ID: 1417967224.7.1376066893258.JavaMail.firstname.lastname@example.org ... Content-Type: multipart/mixed; boundary="----=_Part_4_779913225.1376066893257" To: undisclosed-recipients:;
It should send to the list added in the Notify tab of repositories. This breaks existing email filter rules and spam filters.