Autoconfig/autodiscover does not work with ANY well-known mobile mail client

- On [k9-mail](https://play.google.com/store/apps/details?id=com.fsck.k9&hl=fr) and [thunderbird](https://play.google.com/store/apps/dev?id=8696262544613553264&hl=fr), it doesn't work, maybe because of this: https://github.com/thunderbird/thunderbird-android/issues/8158 They try to access autoconfig without providing email parameter - On [Bluemail](https://play.google.com/store/apps/details?id=me.bluemail.mail&hl=fr), autoconfig/discover just infinitely loads, idk why, could be the same reason, who knows - On [this one](https://play.google.com/store/apps/details?id=com.easilydo.mail&hl=fr) , selecting exchange gives the same behavior (infinite load) than bluemail, and selecting "other" just doesn't work - On [Outlook](https://play.google.com/store/apps/details?id=com.microsoft.office.outlook&hl=fr), it proposes only "imap" or "pop3" then fails to connect - [EMclient](https://play.google.com/store/apps/details?id=com.emclient.mailclient&hl=fr) infinitely loads after typing password - [Gmail](https://play.google.com/store/apps/details?id=com.google.android.gm&hl=fr) hangs on "recovering account informations" when selecting exchange And when selecting "other", "imap", it says "security not garanteed" and ask to manually edit params, providing not working ones by default - FairEmail: "no response from server, Couldn't connect to host, port my _ipv6, 993, timeout" Could it be due to IPV6 ? If so, how would we fix that ?