's ok; I did that as soon as I read your post.
It's odd as my system was completely locked down until I added greylisting!

Strange though!
I'm hoping that somewhere I've an old backup (using the predecessor of kopano .. can't think what it was called off-hand) that I can look back at .. that was solidly locked down .. as was this build(!) before the disk corruption (it's a VM) that screwed it completely (which is what prompted me to expand the BMB system to create backups over a number of days - I backup the entire VM so I can reinstate with no downtime).