Dec 22 15:01:01 collab sendmail[4963]: sBMK111o004963: to=addresses@obscured, ctladdr=warn (509/510), delay=00:00:00, xdelay=00:00:00, mailer=relay, pri=60536, relay=[127.0.0.1] [127.0.0.1], dsn=4.0.0, stat=Deferred: Connection refused by [127.0.0.1]