your mta has a certificate that expired 18 months ago:
Quote:
Caused by: com.zimbra.cs.mailbox.MailSender$SafeMessagingExce ption: java.security.cert.CertificateExpiredException: NotAfter: Wed May 02 21:53:56 GMT+01:00 2007; chained exception is:
javax.net.ssl.SSLHandshakeException: java.security.cert.CertificateExpiredException: NotAfter: Wed May 02 21:53:56 GMT+01:00 2007
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