[Feature]: Mail Accounts on IPv6 only server

[RalfPeter]

Is your feature request related to a problem?

I cannot add mail account on a server which can only be reached by a IPv6 address

Describe the solution you'd like

Allow mail server on IPv6 server

Additional context

No response

[CamelT0E]

You seem to be using a Synology Diskstation on which you have Mailarchiver installed.
Please note that IPv6 is not installed by default in the container manager and there may be problems with some applications in the bridge, e.g. passing on the correct IP or similar. Have you ever tried to run the mailarchiver on the host network? I think this might narrow down your problem. With the option: network_mode: host you can easily create a container in the host network. You can then dispense with the port entry.

Please report if the error still exists. Alternatively, you can also activate IPv6 in an extra bridge network. As a quick test, however, the first variant is preferable. I'm not assuming a bug in the application, but a Synology peculiarity.