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Article ID: 114224, created on Jun 27, 2012, last review on Aug 12, 2014

  • Applies to:
  • Operations Automation


When trying to use Open-Xchange webmail the E-Mail button is disabled and the similar errors are displayed:

Error:The IP address of host


The E-Mail module is not available

And the similar output is displayed in /var/log/open-xchange/open-xchange.log.0 on Open-Xchange server:
SEVERE: MSG-1022 Category=5 Message=The IP address of host "" could not be determined exceptionID=-819851250-540
MSG-1022 Category=5 Message=The IP address of host "" could not be determined exceptionID=-819851250-540
        at com.openexchange.mail.mime.MIMEMailException.handleMessagingException(
        at com.openexchange.imap.IMAPAccess.connectInternal(
        at com.openexchange.mail.api.MailAccess.delegateConnectInternal(
        at com.openexchange.mail.api.MailAccess.connect0(
        at com.openexchange.mail.api.MailAccess.connect(
        at com.openexchange.mail.MailServletInterfaceImpl.initMailAccess(
        at com.openexchange.mail.MailServletInterfaceImpl.initConnection(


Most likely Open-Xchange server does not have correct resolving name servers configured.


Verify that proper resolving name servers are specified in /etc/resolv.conf on Open-Xchange host so the IMAP server will be accessible via hostname.

Also see

6602 Customer can not log into webmail for Qmail mailboxes

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