macOS: new emails only appear after quitting and reopening the app (iOS updates immediately)

[GBG93]

Pre-checks

• This is not a feature request. Existing functionality does not work as intended, not missing functionality. I will request features via discussions, reddit or support
• I've searched and did not find a similar issue.
• My report does not have personal or private information like email address or recovery code

App version

355.260720.0

Operating System

macOS

OS version

26.5.2

What happened?

New emails arrive on the server and show up immediately on iPhone (push notification + message visible in the iOS app).

The macOS desktop app, if already open, does not show the new message until I fully quit and reopen it. After restart, the email appears.

Expected: macOS app should sync/show new mail while it stays open.
Actual: inbox on macOS stays stale until app restart.

Steps:

1. Keep Tuta macOS app open
2. Receive/send a test email to the account
3. Confirm it appears on iOS right away
4. Check macOS app without restarting → email missing
5. Quit macOS app completely and reopen → email is there

Other context

Notes:

• Seems like live sync on the desktop client stops until process restart
• No personal email address or recovery code included in this report
• VPN: yes — Proton VPN runs on the ASUS modem/router (network-wide). Both macOS and iPhone are under the same VPN umbrella. iOS still updates immediately; only the already-open macOS app fails until restart.
• No separate per-device firewall rules that I know of (no Little Snitch blocking Tuta on Mac).

[ganthern]

Hey there 👋

Thanks for your detailed report! Just to confirm, the macOS app fails to sync 100% of the time, or does it work for some time / sometimes and then stop? Do calendar events you add to the calendar on iOS appear on the macOS app?

It would likely be useful if you could send us some logs from the macOS app after it fails to sync (There's a button in the Settings -> About dialog where you can copy them). An E-Mail to hello@tutao.de referencing this issue would work fine.

[GBG93]

Hey @ganthern — thanks again for the quick follow‑up.

Just wanted to share an update: I retested and the macOS app is syncing new mail instantly again while left open. So it doesn’t seem like a consistent or guaranteed failure.

Frequency: Last week it happened multiple times — the macOS app stayed stale until a full quit/reopen, while iOS updated right away. Today, live mail sync on macOS is working normally again.

Calendar: I checked calendar just now and it’s behaving as expected (events added on iOS appear on macOS without restarting). I’m not sure whether calendar was affected during last week’s mail‑sync issues — I only noticed the inbox problem at the time.

Logs: Since everything is working right now, I don’t have a fresh “failed to sync” capture. If it happens again, I’ll grab logs from Settings → About and send them to hello@tutao.de referencing this issue.

Happy to keep an eye on it and report back if it regresses.

[andrehgdias]

Thanks for noticing and reporting!
Since it is not a problem anymore I will be closing the issue.
If it happens again feel free to reopen and mail support.