sendmail issue on hudson.zones

[Giridharan Kesavan]

sendmail on zones fails with the following error.
Can someone from the infra take a look?
hostname: hudson.zones.apache.org

May  6 04:30:39 hudson.zones.apache.org svc.startd[674]: [ID 748625 
daemon.error] network/smtp:sendmail failed: transitioned to maintenance 
(see 'svcs -xv' for details)

Thanks,
Giri