I didn't let it through. The original email sent by the person was rejected from the mailing list. If you received it, it means the person emailed it directly to you in addition to mailing it to the mailing list address. Notice that this thread was started by someone *replying* to the email, not the original email itself.
The first email I see on this thread was Michael Smith replying to you, and it looks like it was sent just to the mailing list.