I am having a similar problem, although I do not have such a complex set-up.
I use mail-notification on my laptop, with an imap account and a gmail account. (note: the details of the imap account show the connection type as "in band SSL/TLS". Mail notification behaves fine until I unplug my ethernet connection. shortly afterwards (i haven't measured the time - anyone know how i might?) the cpu usage jumps to 100% until I kill the application. I think that it takes longer than the mail account refresh period. Running debian testing. -------------------- Mail Notification version 3.0 Copyright (C) 2003-2006 Jean-Yves Lefort. Mailbox backends: mbox yes mh yes Maildir yes POP3 yes IMAP yes Gmail yes Evolution yes Sylpheed yes POP3 and IMAP features: SSL/TLS no SASL yes IPv6 yes Sylpheed features: .sylpheed_mark locking no