One of the authors of this thread left to Postbox.
I checked PostBox if the IMAP-messages I have also get stuck in Postbox. 3 out of 5 get through.
Of those 3 2 get through when I move them to another directory, and then let them reload completely before I open them in Thunderbird.
The other one (12 MB) contains two attachments of which one refuses to load.
The other 2 messages also fail to download in postbox. Postbox however doesn't lock up the downloading of the rest.
Conclusion: Postbox will probably have a better heuristic or cuts impossible downloads earlyer, but still uses this heuristic philosophy over a reliable method.
One of the authors of this thread left to Postbox.
I checked PostBox if the IMAP-messages I have also get stuck in Postbox. 3 out of 5 get through.
Of those 3 2 get through when I move them to another directory, and then let them reload completely before I open them in Thunderbird.
The other one (12 MB) contains two attachments of which one refuses to load.
The other 2 messages also fail to download in postbox. Postbox however doesn't lock up the downloading of the rest.
Conclusion: Postbox will probably have a better heuristic or cuts impossible downloads earlyer, but still uses this heuristic philosophy over a reliable method.