Hi,
When I look at the list of e-mails in my inbox, the first line for each mail shows the subject, while the second line shows the sender - mostly.
For some e-mails, the second line shows “To:” and then my e-mail address. In these cases, the profile picture for these mails also changes to my own picture.
This consistently happens for at least one person regularly sending me e-mails.
I have tried all kinds of settings, but this behavior never changes. I can even see similar behavior in the screenshots in the K9 documentation here:
When the app has determined that you are the sender of a message it won’t display the sender’s address, but the recipient’s address prefixed with “To:”. This should be the case for all messages in the Sent folder.
To figure out whether you are the sender of a message the app compares the ‘From’ address in the email with the email addresses of all identities belonging to the account the message is stored in.
You can see a list of the identities configured in K-9 Mail by going to account settings, then ‘Sending mail > Manage identities’. Does this list contain an identity with the email address of that other person?