Stopped working after upgrade

[cketti]

To manually refresh a folder check out this post:

How to manually check for new messages / sync a folder?

In K-9 Mail 5.800 the “pull to refresh” pattern is used to check for new messages. Manually sync a folder Swipe down on the list of messages. Once the circular progress indicator is fully visible release your finger and K-9 Mail will sync this folder. Manually sync an account Open the side drawer, swipe down on the list of folders. Once the circular progress indicator is fully visible release your finger and K-9 Mail will sync this account. Manually sync all accounts O…

If automatic sync does not work please check the settings…

• Settings > [Account] > Fetching mail > Folder poll frequency
• Settings > [Account] > Fetching mail > Poll folders

For a guide on how to configure Push see the following post:

How to configure Push?

K-9 Mail (5.735 and newer) supports Push for IMAP accounts. Push means the app will maintain a connection to the incoming mail server and be notified as soon as a new message arrives. Enable Push for an account When setting up a new account Push is disabled by default. To enable it go to Settings, select the account you want to configure, then open the Fetching mail section. The Push folders setting is used to configure which class of folders should use the Push mechanism to wait for new messa…

If all of that doesn’t help, please let us know more about your account. What protocol are you using? IMAP, POP3? Does manually refreshing the account work? What sync mechanism are you using?