I have 2 Gmail accounts. When I tried adding one of them to the Mail app, something really annoying happened. The other Gmail account keeps receiving forwarded emails from this account. All emails in this added account were being forwarded there and I did not know how to stop that. I checked the Forwarding and POP/IMAP settings in both Gmails but there's no forwarding configured. I disabled POP, too. I tried disconnecting the two Gmail accounts in Google's setting, but problem still not solved. I don't understand, by now this account should know nothing about the other, but when I add it to the Mail app, the crazy forwarding started again.
Just to be clear, I only added one of the two Gmails to the Mail app, so the Mail app should not know anything about the other account. Then the wrong must be in Google's side, but I disconnected them and checked every setting, still have no clue why they still are linked somehow. I did nothing strange before, just having this two Gmail accounts and trying to add one to the Mail app, so I guess it shouldn't be a rare problem. But there seemed to be no relevant solutions when I googled. Could someone help me with this? Does anyone have a similar problem?