Sync Mailbox Option

**Describe the bug**
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**To Reproduce**
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1. Go to '...'
2. Click on '....'
3. Scroll down to '....'
4. See error

**Expected behavior**
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**Screenshots (Optional)**
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**Device and System information (please complete the following information):**
- Device: [e.g. Macbook Pro] **Debian 10 Buster Xfce Laptop**
- OS Version: [e.g. High Sierra]
- App Version: [e.g. 0.11.0] **0.28.0**

**Additional information**

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**Android was out of date, Appimage was up to date. I did a Sync Mailbox on Appimage, and then the latest email on Linux Appimage disappears.**

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