Deleting Spam

I just went through the Trash folder in my in-box and deleted 210,573K (~205 MB) worth of spam messages.

I do this a few times a year. I haven't done it since February, so all these spam messages were recieved between February 1st and August 16th.

After deletion, my e-mail folder took up 855 megabytes on my hard drive, estimating that ~19% of all e-mail was spam messages.

I believe the size of my e-mail folder is inflated due to orphaned (and valid) attachments> According to K9, 70% of all e-mails I recieve are SPAM and it detects them with a reate of 99.09% accuracy. 99% accuracy still means that I have to classify ~3-5 e-mails a day as SPAM.

There must be a better solution.