Tom in London wrote:
That's strange; I use Apple mail all the time and have never experienced that problem.
I believe you. BTW: Do you use IMAP or POP?
As a very good alternative I would highly recommend Thunderbird, which you can customise to your heart's content by installing add-ons.
Postbox is based on Thunderbird too.
PostBox is a commercial email client from a startup founded by Scott McGregor (the former Thunderbird lead engineer) and Sherman Dickman (a former Director of Product Management at Mozilla Corporation). You have to pay for any updates. It does not have an open source license, a Linux version, or support any languages other than English though there are several community-translated Language Packs. Postbox has much stricter system requirements than Thunderbird and drops support for older versions of operating systems quicker. It can import data and settings from a Thunderbird profile. Mozbackup (backup) supports it.