I have one email account that I check via POP with MS Outlook. I set it so that mail is left on the server and deleted after it is older than X days. I use K-9 to read mail via POP for another account on my phone. I set K-9 to only keep last 100 messages and was under impression that everything older will be erased from the server automatically. Today I found out it doesn't work like that - my mailbox on the server got full - messages were never deleted. Can K-9 be set up similar to Outlook in that respect? I found multiple options like "Delete on a server if you delete message locally" but I don't want to delete anything locally by hand - this email is used only to receive status reports from automated jobs and I receive too many messages every day to delete them manually. I don't mind switching from POP to IMAP if this would help.