I have an apple machine running Yosemite. I use Apple Mail. I recently received a message from a colleague. When I try to open this message, Mail crashes.
In fact Mail crashes even if I scroll through the message without actually opening it.
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Try this, it helped to me, but mail didn't crashed when I was only scrolling through.
Learn how to troubleshoot if Mail unexpectedly quits when viewing a certain message or messages.
This can happen if the mail message is malformed or damaged in some way. In certain situations, Mail may unexpectedly quit when attempting to display the message.
If you select such a message, Mail may quit each time you open the application.
Use the steps below to open Mail without rendering any messages that are currently selected:
Open Mail and immediately hold the Shift key until Mail completely launches. This will cause Mail to launch without any Mail message or mailbox selected.
Follow the steps below to delete the problematic message:
Carefully drag the Message Viewer window pane until only the list of messages appears (or, double-click the pane). This will prevent any Mail message's content from being shown unless you double-click the message.
Had the same problem: one random email would freeze and crash Apple mail even if I scrolled over it without opening it. What finally worked was this: highlight a different message. Then hold down "Control" and click on the bad email — this allows you to "box in" the selected email without actually selecting it. You can then click delete and the email will be deleted without trouble. (Empty Trash right away to make sure the bad message is gone.)