Originally Posted by JSanders
The BlackBerry will always send from the LAST email account you emailed to that contact.
So, the defauilt is the overall default, but if you have emailed certain contacts from another address, it will choose that first. Just change it as you email people and you'll be good from thereon.
In case the OP needs an extra tip, try to copy
the person's email add. and enter it in the "To" field..., so you can use your new default email account.
I know it is kinda tricky at first, because I have 3 email accts. on my phone, and I was having trouble at first getting the hang of it.