There is probably a very simple answer to my question but it's stumped me.
A mate has 2 email accounts in O.E 6, one for personal and one for business. He can send and receive from both with no problem but when he hits the reply button on a personal email his business address is put into the 'from' field. How does he get it to put his personal address in the 'from' field. At the moment he has to click the drop down box and select his personal address.
If he wants to use mostly his personal address for outgoing emails he should change that account to be his default under the "Tools / Accounts / Mail" menu option, by highlighting the account and clicking the "Set as default" button on the right side.
His personal account is set as the default, the problem only arises when replying to emails via the reply button. Replying to an email to his personal email address puts his business email address in the 'from' field. He can change it by using the drop down box if he remembers to do it.
I don't know why this is happening, then. I also have two OE6 accounts, and when I hit reply to an email the address appearing in the "From" field is whichever account the original was sent to. When composing a new email it is the default address that appears in the "From" field.
Perhaps someone else knows what's happening to your friends OE6.