Bugzilla

Another simpler fix for the sample message is to just set ```mail.server.default.mime_parts_on_demand``` to true. This will a fetch the message by "parts" instead getting the whole thing at once. However, this just barely fixes the problem because the larger PDF part is just below 25M in size. If it were any larger it again wouldn't fit in the default 25M memory slot and the problem would recur.

Note: ```mail.server.default.mime_parts_on_demand``` now defaults to false to accommodate the recently added encryption/signature features which won't work without having the whole message fetched and stored in memory.

Another simpler fix for the sample message is to just set ```mail.server.default.mime_parts_on_demand``` to true. This will fetch the message by "parts" instead getting the whole thing at once. However, this just barely fixes the problem because the larger PDF part is just below 25M in size. If it were any larger it again wouldn't fit in the default 25M memory slot and the problem would recur.

Note: ```mail.server.default.mime_parts_on_demand``` now defaults to false to accommodate the recently added encryption/signature features which won't work without having the whole message fetched and stored in memory.

Another simpler fix for the sample message is to just set ```mail.server.default.mime_parts_on_demand``` to true. This will fetch the message by "parts" instead getting the whole thing at once. However, this just barely fixes the problem because the larger PDF part is just below 25M in size. If it were any larger it again wouldn't fit in the default 25M memory slot and the problem would recur.

Note: ```mail.server.default.mime_parts_on_demand``` now defaults to false to accommodate the recently added encryption/signature features which won't work without having the whole message fetched and stored in memory.

Edit: Another workaround is here: bug 1673093 comment 21
If you are unable to open or save the attachment, copy the message to a Local Folder and you should be able to open it from there.  Actually, this should work if you copy the message to any folder having (disk based) offline store, like a POP3 folder or another imap folder having offline store.