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EDIT: I have also tried different IMAP hostnames: localhost, host.domain.tld, host.local.lan, 0.0.0.0 and xxx.xxx.xxx.xxx. No luck…EDIT2: I have also tried to set the IMAP server to listen on an unpriviliged port and use IP-tables to NAT/Redirect. Still nuttin'…
The IMAP service may still be listening on the wrong network adapter. When you ping the server from the machine with the IMAP client, what does its IP address resolve to? Make sure that the IMAP server is listening on the same IP address. 'localhost' may not resolve to the network adapter connected to the outside world so you should probably specify an explicit IP.
00:00:22,054 INFO [org.alfresco.repo.imap.AlfrescoImapServer] IMAP service started on hostort 10.70.10.20:143.