Use app less than a month. Wrote to me that 80% of space i have been used. How i can fix it ?
What exact version of K9 do you use?
Are you using IMAP or POP?
Did you fetch all mails from server or just like default 25 or so?
80% is relative - how much space is used?
Do you use big attachments?
Yes, please state: WHAT says “80% space is used”? What space? Your Mail servers space? Your phone storage?
Do you have a program that can list files? Amaze Utilities (F-Droid) can do that
If its mail storage, simply delete mails. If its phone storage and you dont mail videos and images a lot, it will probably not be K9mail.