Sony Xperia XZ

Sony
unofficial

Notifications, background tasks, automatic synchronization or alarms do not work correctly for “K-9 Mail” on your Sony Xperia XZ?


  1. Open the “Settings” of your device.
  2. Choose “Storage & memory”.
  3. Next to “Smart cleaner”, if the switch is turned off, i.e. with its knob or handle at the left, there’s nothing left for you to do. Otherwise, proceed with the next step.
  4. At the top right, tap on ⋮ (three dots) to open the expanded menu.
  5. Choose “Advanced”.
  6. Add “K-9 Mail” to the “Whitelist”.
  7. Leave by pressing ○ (“Home”) at the bottom of your device.
  8. Open “K-9 Mail” on your device.
  9. Leave by pressing ○ (“Home”) at the bottom of your device.

Have you been able to follow these steps on your Sony Xperia XZ?


  1. Open the “Settings” of your device.
  2. Choose “Battery” or “Power management”.
  3. Choose “Stamina mode”.
  4. At the top, make sure that the switch is turned off, i.e. with its knob or handle at the left.
  5. Next to “Extended standby”, make sure that the switch is turned off, i.e. with its knob or handle at the left.
  6. Next to “Extended usage”, make sure that the switch is turned off, i.e. with its knob or handle at the left.
  7. Next to “Stamina clock”, make sure that the switch is turned off, i.e. with its knob or handle at the left.
  8. Tap on “Apps active in standby”.
  9. If “K-9 Mail” is already in the list, there’s nothing left for you to do. Otherwise, proceed with the next step.
  10. At the top, tap on “Add applications”.
  11. Find “K-9 Mail” in the list of apps.
  12. Next to “K-9 Mail”, put a checkmark into the checkbox.
  13. At the bottom, tap on “Done”.
  14. Leave by pressing ○ (“Home”) at the bottom of your device.
  15. Open “K-9 Mail” on your device.
  16. Leave by pressing ○ (“Home”) at the bottom of your device.

Have you been able to follow these steps on your Sony Xperia XZ?


  1. Open the “Settings” of your device.
  2. Choose “Battery” or “Power management”.
  3. Choose “Stamina mode”.
  4. Select “Never”.
  5. Leave by pressing ○ (“Home”) at the bottom of your device.
  6. Open “K-9 Mail” on your device.
  7. Leave by pressing ○ (“Home”) at the bottom of your device.

Have you been able to follow these steps on your Sony Xperia XZ?


  1. Open the “Settings” of your device.
  2. Choose “Battery” or “Power management”.
  3. Choose “Ultra Stamina mode”.
  4. At the top, make sure that the switch is turned off, i.e. with its knob or handle at the left.
  5. Leave by pressing ○ (“Home”) at the bottom of your device.
  6. Open “K-9 Mail” on your device.
  7. Leave by pressing ○ (“Home”) at the bottom of your device.

Have you been able to follow these steps on your Sony Xperia XZ?


  1. Open the “Settings” of your device.
  2. Choose “Stamina mode”.
  3. At the top, if the switch is turned off, i.e. with its knob or handle at the left, there’s nothing left for you to do. Otherwise, proceed with the next step.
  4. Below “Apps active in standby”, if “K-9 Mail” is already in the list, there’s nothing left for you to do. Otherwise, proceed with the next step.
  5. Tap on “Add applications”.
  6. Find “K-9 Mail” in the list of apps.
  7. Next to “K-9 Mail”, put a checkmark into the checkbox.
  8. At the bottom, tap on “Done”.
  9. Leave by pressing ○ (“Home”) at the bottom of your device.
  10. Open “K-9 Mail” on your device.
  11. Leave by pressing ○ (“Home”) at the bottom of your device.

Have you been able to follow these steps on your Sony Xperia XZ?


  1. Open the “Settings” of your device.
  2. Choose “Battery” or “Power management”.
  3. At the top right, tap on ⋮ (three dots) to open the expanded menu.
  4. Choose “Battery optimization”.
  5. In the “Not optimized” section, if “K-9 Mail” is in the list, there’s nothing left for you to do. Otherwise, proceed with the next step.
  6. Switch to the “All others” section.
  7. Find “K-9 Mail” in the list of apps.
  8. Next to “K-9 Mail”, make sure that there is a checkmark in the checkbox.
  9. Leave by pressing ○ (“Home”) at the bottom of your device.
  10. Open “K-9 Mail” on your device.
  11. Leave by pressing ○ (“Home”) at the bottom of your device.

Have you been able to follow these steps on your Sony Xperia XZ?


  1. Open the “Settings” of your device.
  2. Choose “Battery” or “Power management”.
  3. At the top right, tap on ⋮ (three dots) to open the expanded menu.
  4. Choose “Power-saving exceptions”.
  5. At the top, select “Apps”.
  6. Find “K-9 Mail” in the list of apps.
  7. Next to “K-9 Mail”, make sure that there is a checkmark in the checkbox.
  8. Leave by pressing ○ (“Home”) at the bottom of your device.
  9. Open “K-9 Mail” on your device.
  10. Leave by pressing ○ (“Home”) at the bottom of your device.

Have you been able to follow these steps on your Sony Xperia XZ?


  1. Open the “Settings” of your device.
  2. Choose “Network & Internet”.
  3. Choose “Data usage”.
  4. Choose “Data saver”.
  5. Make sure that the switch is turned off, i.e. with its knob or handle at the left.
  6. Choose “Unrestricted data access”.
  7. Add “K-9 Mail”.
  8. Leave by pressing ○ (“Home”) at the bottom of your device.

Have you been able to follow these steps on your Sony Xperia XZ?


  1. Open the “Settings” of your device.
  2. Choose “Apps & notifications”.
  3. Tap on “See all … apps”.
  4. Choose “K-9 Mail” from the list of apps.
  5. Choose “App notifications”.
  6. At the top, make sure that the switch is turned on, i.e. with its knob or handle at the right.
  7. Leave by pressing ○ (“Home”) at the bottom of your device.

Have you been able to follow these steps on your Sony Xperia XZ?


  1. Open the “Settings” of your device.
  2. Choose “Users & accounts”.
  3. Next to “Automatically sync data”, make sure that the switch is turned on, i.e. with its knob or handle at the right.
  4. Leave by pressing ○ (“Home”) at the bottom of your device.

Have you been able to follow these steps on your Sony Xperia XZ?


  1. Open the “Settings” of your device.
  2. Choose “Apps & notifications”.
  3. Tap on “See all … apps”.
  4. Choose “K-9 Mail” from the list of apps.
  5. Choose “Permissions”.
  6. Make sure that all switches are turned on, i.e. with their knobs or handles at the right, unless you have any specific objections.
  7. Leave by pressing ○ (“Home”) at the bottom of your device.

Have you been able to follow these steps on your Sony Xperia XZ?


  1. Open the “Settings” of your device.
  2. Choose “Battery”.
  3. At the top right, tap on ⋮ (three dots) to open the expanded menu.
  4. Choose “Battery optimization”.
  5. In the drop-down list at the top, switch from “Not optimized” to “All apps”.
  6. Choose “K-9 Mail” from the list of apps.
  7. Switch from “Optimize” to “Don’t optimize”.
  8. Tap on “Done”.
  9. Leave by pressing ○ (“Home”) at the bottom of your device.
  10. Open “K-9 Mail” on your device.
  11. Leave by pressing ○ (“Home”) at the bottom of your device.

Have you been able to follow these steps on your Sony Xperia XZ?


  1. Open the “Settings” of your device.
  2. Choose “Battery”.
  3. Next to “Battery saver”, make sure that the switch is turned off, i.e. with its knob or handle at the left.
  4. Leave by pressing ○ (“Home”) at the bottom of your device.
  5. Open “K-9 Mail” on your device.
  6. Leave by pressing ○ (“Home”) at the bottom of your device.

Have you been able to follow these steps on your Sony Xperia XZ?


  1. Open the “Settings” of your device.
  2. Choose “Network & Internet”.
  3. Choose “Data usage”.
  4. Tap on “Data saver”.
  5. At the top, make sure that the switch is turned off, i.e. with its knob or handle at the left.
  6. Leave by pressing ○ (“Home”) at the bottom of your device.

Have you been able to follow these steps on your Sony Xperia XZ?


  1. Open the “Settings” of your device.
  2. Choose “Notifications”.
  3. Choose “K-9 Mail” from the list of apps.
  4. Next to “Block all”, make sure that the switch is turned off, i.e. with its knob or handle at the left.
  5. Leave by pressing ○ (“Home”) at the bottom of your device.

Have you been able to follow these steps on your Sony Xperia XZ?


  1. Open the “Settings” of your device.
  2. Choose “Apps”.
  3. Choose “K-9 Mail” from the list of apps.
  4. Choose “Notifications”.
  5. Next to “Block all”, make sure that the switch is turned off, i.e. with its knob or handle at the left.
  6. Leave by pressing ○ (“Home”) at the bottom of your device.

Have you been able to follow these steps on your Sony Xperia XZ?


  1. Open the “Settings” of your device.
  2. Choose “Accounts”.
  3. At the top right, tap on ⋮ (three dots) to open the expanded menu.
  4. Next to “Auto-sync data”, make sure that there is a checkmark in the checkbox.
  5. Leave by pressing ○ (“Home”) at the bottom of your device.

Have you been able to follow these steps on your Sony Xperia XZ?


  1. Open the “Settings” of your device.
  2. Choose “Apps”.
  3. Choose “K-9 Mail” from the list of apps.
  4. Choose “Permissions”.
  5. Make sure that all switches are turned on, i.e. with their knobs or handles at the right, unless you have any specific objections.
  6. Leave by pressing ○ (“Home”) at the bottom of your device.

Have you been able to follow these steps on your Sony Xperia XZ?


  1. Open the “Settings” of your device.
  2. Choose “Battery”.
  3. At the top right, tap on ⋮ (three dots) to open the expanded menu.
  4. Choose “Battery optimization”.
  5. In the drop-down list at the top, switch from “Not optimized” to “All apps”.
  6. Choose “K-9 Mail” from the list of apps.
  7. Switch from “Optimize” to “Don’t optimize”.
  8. Tap on “Done”.
  9. Leave by pressing ○ (“Home”) at the bottom of your device.
  10. Open “K-9 Mail” on your device.
  11. Leave by pressing ○ (“Home”) at the bottom of your device.

Have you been able to follow these steps on your Sony Xperia XZ?


  1. Open the “Settings” of your device.
  2. Choose “Battery”.
  3. Tap on “Battery saver”.
  4. At the top, make sure that the switch is turned off, i.e. with its knob or handle at the left.
  5. Leave by pressing ○ (“Home”) at the bottom of your device.
  6. Open “K-9 Mail” on your device.
  7. Leave by pressing ○ (“Home”) at the bottom of your device.

Have you been able to follow these steps on your Sony Xperia XZ?


  1. Open the “Settings” of your device.
  2. Choose “Data usage”.
  3. Tap on “Data saver”.
  4. At the top, make sure that the switch is turned off, i.e. with its knob or handle at the left.
  5. Leave by pressing ○ (“Home”) at the bottom of your device.

Have you been able to follow these steps on your Sony Xperia XZ?


  1. Open the “Settings” of your device.
  2. Choose “Sound & notification”.
  3. Choose “App notifications”.
  4. Choose “K-9 Mail” from the list of apps.
  5. Next to “Block all”, make sure that the switch is turned off, i.e. with its knob or handle at the left.
  6. Leave by pressing ○ (“Home”) at the bottom of your device.

Have you been able to follow these steps on your Sony Xperia XZ?


  1. Open the “Settings” of your device.
  2. Choose “Apps”.
  3. Choose “K-9 Mail” from the list of apps.
  4. Choose “Notifications”.
  5. Next to “Block all”, make sure that the switch is turned off, i.e. with its knob or handle at the left.
  6. Leave by pressing ○ (“Home”) at the bottom of your device.

Have you been able to follow these steps on your Sony Xperia XZ?


  1. Open the “Settings” of your device.
  2. Choose “Accounts”.
  3. At the top right, tap on ⋮ (three dots) to open the expanded menu.
  4. Next to “Auto-sync data”, make sure that there is a checkmark in the checkbox.
  5. Leave by pressing ○ (“Home”) at the bottom of your device.

Have you been able to follow these steps on your Sony Xperia XZ?


  1. Open the “Settings” of your device.
  2. Choose “Apps”.
  3. Choose “K-9 Mail” from the list of apps.
  4. Choose “Permissions”.
  5. Make sure that all switches are turned on, i.e. with their knobs or handles at the right, unless you have any specific objections.
  6. Leave by pressing ○ (“Home”) at the bottom of your device.

Have you been able to follow these steps on your Sony Xperia XZ?


  1. Open the “Settings” of your device.
  2. Choose “Battery”.
  3. At the top right, tap on ⋮ (three dots) to open the expanded menu.
  4. Choose “Battery optimization”.
  5. In the drop-down list at the top, switch from “Not optimized” to “All apps”.
  6. Choose “K-9 Mail” from the list of apps.
  7. Switch from “Optimize” to “Don’t optimize”.
  8. Tap on “Done”.
  9. Leave by pressing ○ (“Home”) at the bottom of your device.
  10. Open “K-9 Mail” on your device.
  11. Leave by pressing ○ (“Home”) at the bottom of your device.

Have you been able to follow these steps on your Sony Xperia XZ?


  1. Open the “Settings” of your device.
  2. Choose “Battery”.
  3. At the top right, tap on ⋮ (three dots) to open the expanded menu.
  4. Choose “Battery saver”.
  5. At the top, make sure that the switch is turned off, i.e. with its knob or handle at the left.
  6. Leave by pressing ○ (“Home”) at the bottom of your device.
  7. Open “K-9 Mail” on your device.
  8. Leave by pressing ○ (“Home”) at the bottom of your device.

Have you been able to follow these steps on your Sony Xperia XZ?


  1. There are many apps on the app store which claim to boost performance, free up space, save battery, or optimize the RAM of your device. However, these apps interfere with other apps, like “K-9 Mail”, and prevent them from working correctly.
  2. If you have any app like “Clean Master”, “Security Master”, “Task Manager”, “Phone Cleaner”, “Super Cleaner”, “Power Clean”, “DU Cleaner”, “DU Speed Booster”, “CCleaner”, “AVG Cleaner”, “Avast Cleanup” or “Norton Clean”, check that it doesn’t block or terminate “K-9 Mail”.
  3. If unsure, consider uninstalling the app claiming to “clean” or “boost” your device.

Have you been able to follow these steps on your Sony Xperia XZ?


  1. If you’ve made any changes based on the advice above and you’ve adjusted the settings of your device, proceed with the next step. Otherwise, there’s nothing left for you to do.
  2. Restart your device once. You can either choose the “Restart” option directly, if available, or turn off your device, wait a few seconds, and then turn it on again manually.
  3. Open “K-9 Mail” once on your device – by tapping on “K-9 Mail” on your home screen or in the list of all apps.
  4. Leave by pressing ○ (“Home”) at the bottom of your device.

Have you been able to follow these steps on your Sony Xperia XZ?