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Description
I am reporting a bug. Since upgrading to Mailcow 2024-04 on April 13th, new emails received by mailboxes are not being delivered to Outlook clients running on Android.
I have had the users completely clear their cache and stored data and gone through setting up Outlook from scratch on their clients.
The client authenticates just fine, and the mailbox contents are downloaded, but any mail received after April 13th (the day Mailcow was updated) are not delivered.
The emails however DO appear in Sogo, and using other clients such as Thunderbird on the desktop.
The issue appears to only be affecting Outlook clients on Android.
### Steps to reproduce:
```plain text
1. Upgrade to 2024-04
2. Receive mail
3. Notice that new mail received is not being delivered to Outlook clients running on Android
It seems that Microsoft changed something a few days ago and that the Outlook App is doing strange things which may run at Microsoft, not in the app itself...
One user had the same problems with 2024-02, so it's not a mailcow or Sogo issue
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I've found a bug and checked that ...
Description
Logs:
Which branch are you using?
master
Which architecture are you using?
x86
Operating System:
Debian GNU/Linux 11 (bullseye)
Server/VM specifications:
6 cores, 16 GB
Is Apparmor, SELinux or similar active?
no
Virtualization technology:
qemu
Docker version:
26.0.0
docker-compose version or docker compose version:
v2.25.0
mailcow version:
2024-04
Reverse proxy:
nginx
Logs of git diff:
Logs of iptables -L -vn:
Logs of ip6tables -L -vn:
Logs of iptables -L -vn -t nat:
Logs of ip6tables -L -vn -t nat:
DNS check:
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