Q: I have two main email accounts, and mail is 'forwarding' emails sent to one account to the other older account, they arrive a few hours later. Not sure why it is duplicating my emails at all. How can I stop this?

Kind of hard to explain in the title... that probably makes no sense.

Basically, I used to use a BTinternet email account for everything. But over the years I've switched to my iCloud email account. I have them both set up in Mail because I still have the BTinternet account linked to a lot of things, despite always using the iCloud for new things now.

However, when I get a message that was originally sent to my new iCloud account, it'll appear as a new message in my BTinternet a few hours later. And it's quite annoying! Makes me think I've got a new email, but it's one that I read hours ago.

It's like there's some rule set up causing Mail to forward all messages sent to my iCloud email, to my BTinternet email. I have no idea why this is happening. There are no actual 'rules' set up to do this under my Mail preferences. Not sure what else it could be.

Any ideas?