Hi,
Using 0.8RC since 2 weeks. Two big problems (for me - I'm in webmarketing and send a lot of email campaign -) and a missing feature :
1/ If images display is not allowed, all images are replaced by pink square : background-color/bgcolor is not used. So, all email are similar and text over background-image is not always readable.
2/ alt is not used when images is not shown. It's very annoying because alt attributes contains important text and which can be - a few - styled. For example, on Thunderbird or Gmail, we can colored it, center it, choose font-family, style and size (yes, it's possible to style alt text for most of mail client).
3/ I don't find possibility to display images on demand and add to a white-list. It's my default behavior : display only white-list contact images + my contact + on-demand.
thanks.
You can create feature request tickets on trac.roundcube.net providing sample message source and describing expected behaviour.