We've got a domain and email with 1&1 hosting. The domain has an SPF text record. We've got 8 email accounts, and all but one of them can send emails to external addresses without them going to the recipient's junk folder.
But one of our accounts - which is set up exactly the same as the others - consistently gets all his messages delivered to the recipient's junk folders. All 8 of us have been sending to the same recipient.
I'm trying to think what could cause this behavior - why is just that one account affected? Can anyone give me any pointers? Why is this account - which is brand new - being treated differently.
Not even sure what to google at the moment, so even a lmgtfy link would be appreciated :)
Thanks