Large Email With Attachment Won't Delete ...

This is a very frustrating situation:

1. Someone sent me an email with two images totalling 40mb. Whenever I send it to the trash and try to empty the trash Mail quits and returns to the iPhone home screen. Upon re-opening Mail, I find that the aforementioned email has gone back to the inbox along with other deleted emails.

Question 1. How can I get rid of this email?

2. I have gone into the iPhone Settings and switched off the mail account but when I switch it back on again it just goes back to its last position (all emails sitting inside the inbox, I expected it to delete the account and all emails which accompanied it, especially the large email mentioned above).

Question 2. Is there a way to delete the email account on either the iPhone or in iTunes? I have a few email accounts and only select the ones I need to use on the iPhone by clicking each one within iTunes, but that has never worked (I have to go into the iPhone settings and make the ones I don't want to use as inactive). Also, within iTunes, I have just deselected the aforementioned email account with the large 40mb email and synced the iPhone, but unfortunately it didn't switch it off and thus the account and all emails are still on the iPhone. Help!

Thanks in advance

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