spooled mail is never delivered

hi

james-3.4.0 tarball installed on linux fedora v29 (no docker used). 

echo $JAVA_HOME
/usr/lib/jvm/java-1.8.0-openjdk-1.8.0.232.b09-0.fc29.x86_64/jre

I can telnet to james at ports 143 & 25 - (also to an external mail server, so isp is not blocking port 25)

Everything else mostly looks fine:- 

I create a localhost user and can login using the jwma webmail imap frontend, with any of the three mailstore types configured.

I can create and persist maildir and jpa mailboxes using jwma 

If I send a message either to a local user or to a remote mail exchanger, the james -server.log reports the message has been spooled, but it is never delivered

If I try to send mail to my localhost user with the mailx cli program it is also never received

I do see some error message in logs, but I'm not sure what triggers this (below). It does not appear to be connected to attempts to send mail in any case.

Am I missing some configuration step?

-------------------------------------------------------------------------------

WARN  20:59:32,112 | org.apache.james.imapserver.netty.ImapChannelUpstreamHandler | Error while processing imap request
java.nio.channels.ClosedChannelException
	at org.jboss.netty.channel.socket.nio.AbstractNioWorker.cleanUpWriteBuffer(AbstractNioWorker.java:433)
	at org.jboss.netty.channel.socket.nio.AbstractNioWorker.close(AbstractNioWorker.java:373)
	at org.jboss.netty.channel.socket.nio.NioWorker.read(NioWorker.java:93)
	at org.jboss.netty.channel.socket.nio.AbstractNioWorker.process(AbstractNioWorker.java:108)
	at org.jboss.netty.channel.socket.nio.AbstractNioSelector.run(AbstractNioSelector.java:337)
	at org.jboss.netty.channel.socket.nio.AbstractNioWorker.run(AbstractNioWorker.java:89)
	at org.jboss.netty.channel.socket.nio.NioWorker.run(NioWorker.java:178)
	at org.jboss.netty.util.ThreadRenamingRunnable.run(ThreadRenamingRunnable.java:108)
	at org.jboss.netty.util.internal.DeadLockProofWorker$1.run(DeadLockProofWorker.java:42)
	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
	at java.lang.Thread.run(Thread.java:748)

--
David Matthews
[email protected]