with Fuse ESB 4.4.0-fuse-00-27
with karaf.framework=equinox using camel-mail or Spring email, I have always an exception at runtime java.lang.ClassNotFoundException: javax.mail.MessagingException.
with karaf.framework=felix same bundle work OK.
This is a know issues ?
I try to replace mail-1.4.3 with the geronimo equivalent without success.
Could you please check if your customer bundle import correct version of package javax.mail?