Claws Mail version 3.16.0git248 GTK+ 2.24.31 / GLib 2.48.2 Locale: en_US.UTF-8 (charset: UTF-8) Operating System: Linux 4.4.138-59-default (x86_64) When I'm processing emails quickly - as in filing SPAM reports to SpamCop, I frequently encounter "Already trying to send - Use 'Send Queued Messages' from from the main Window to retry" I would have expected that queueing of messages means just that - messages are queued for subsequent sending. However, it appears that only one message is queued - which IMHO is not "real" queueing... This "bug" has been in Claws ever since I started using it years ago, and it has been "bugging" me ever since on an almost daily basis. It would be great to see this fixed :) Best, Lyle