MailMate keeps needing to reauthenticate with Google

I don't know of any general problems with Gmail OAuth2. Try sending me a screenshot of your IMAP account settings window via “Help ▸ Send Feedback” and I'll see if anything is out of the ordinary.

Any special network conditions which might affect this, that is, something which might make MailMate fail and then (wrongly) assume it needs re-authentication?

Sent the screenshot. Network conditions haven't changed for months, and there are no 'specialities' involved - no proxies, no hw firewalls or anything similar, just my laptop connected via cable/wifi to our home router, which is connected directly to our ISP.

Are there any logs I could collect in MailMate when the issue happens?

Your settings look fine. Before debugging any further I'd like you to try the latest test release: r5831. This is just to make sure I'm not debugging something which has already been fixed.

Open the Activity Viewer in MailMate to enable logging (⌥⌘0). Use MailMate until you have experienced a round of re-authentication and then send me logs by using “Help > Send Server Logs”. Do not relaunch MailMate when doing this (since logs will then be lost). If you cannot make it connect then create the email with the logs and then send it after relaunching/reconnecting.

Thanks! I'll let you know.

Just a quick update: I haven't had the issue since upgrading to r5831, and I feel like it would have almost certainly happened at least once within 3 days. Will continue to monitor and let you know.

Unfortunately, it now happens that, after some time, MailMate starts to drain 60% of my CPU, without there being any apparent need - there is no fetching going on or anything else. It stays that way until I kill it and restart. Any idea what that might be about? I wanted to attach a video of my Activity Monitor, but it doesn't seem to be possible to add attachments.

Thanks for the update. First, fetch r5834. When you see CPU issue then use the Activity Monitor to “Sample” the process. Send me the resulting file using “Help > Send Feedback”.

@benny I'm having the same issue with my outlook email. Do you have any idea why? I'm using the lastest alpha

@Gabriel: I believe the CPU issue has been fixed.

@Kaji: First, make sure to update to the latest test release: Hold down ⌥ when clicking “Check Now” in the Software Update preferences pane. If the issue persists then search for com.freron.MailMate in Keychain Access. Try deleting the tokens related to the problematic account and see if that helps. If not, use “Help ▸ Send Feedback” to send me a screenshot of your IMAP account settings window.