Thank you so much! Someone recently sent me several photos, the message is 10.95MB according to claws-mail, and the date is consistent with when the crashing started. I have two other large messages, 7.20MB and 7.67MB, but they've been there a while and don't seem to cause any problem.

I moved the offending message to its own folder, re-enabled sync, then quit and restarted claws-mail. No crash.

Any idea of the maximum message size for sync to be successful? As a workaround I'm thinking of setting up a processing rule on my mail server to divert large messages to a separate (non-synchronized) folder.

For anyone else who stumbles onto this thread, if claws-mail crashes when you select a synchronized folder, even when you're just trying to get to the popup menu so you can to go to Properties and disable synchronization, the workaround is to disconnect from the network before starting claws-mail. With no network connection, it can't sync with the IMAP server, and you can get to folder properties without crashing the program.

From there I disabled synchronization, quit claws-mail, turned the network connection back on, and restarted claws-mail. I opened my inbox, and with sync disabled, claws-mail didn't crash. Then I clicked on the "Size" column to sort by message size and found the offending huge message. I moved the message to a different (non-sync'ed) folder, re-enabled sync on my inbox, quit and restarted, and claws-mail was happy again and not crashing.

Whew! This has been driving me crazy for about a week. Martin, thanks again for the help!!

logicprobe

Added on 2/27/08: Happened again today with an 8.62MB message. I disabled sync as described above so I could move the message and discovered that Claws-mail crashes when it tries to open the message in non-sync mode. Claws-mail can move the message to another folder, but don't try to actually open the message. As noted above, Claws-mail can deal with a 7.67MB message. So based on today's offending large message, we can infer that the limit is somewhere in the range 7.67MB to 8.62MB.