Migrated fine, but cannot connect via devices

NethServer Version: 8
Module: mail

Hi All,
after long procrastinating, I migrated my homeserver from NS7 to NS8.
After some attempts it went fine, and now I have NS8 running (on proxmox) with juist mail and webtop as apps.
In webtop I can login, send and receive mail > all fine,
However: I cannot get my devices configured to get mail from my server.
Is there somewhere a instruction how to configure an iPad, and an android device (gmail app) to connect?
Maybe related, maybe not, but in the maillog I see some errors:

[1:mail2:dovecot] imap-login: Disconnected: Connection closed: SSL_accept() failed: error:0A000416:SSL routines::ssl/tls alert certificate unknown: SSL alert number 46 (no auth attempts in 0 secs): user=<>, rip=145.94.234.244, lip=192.168.1.110, TLS handshaking: SSL_accept() failed: error:0A000416:SSL routines::ssl/tls alert certificate unknown: SSL alert number 46, session=<13w78IM9Y+KRXur0>

[1:mail2:dovecot] imap-postlogin: Error: <5>impersonated login MASTER_USER=vmail USER=rhea AUTH_USER=vmail IP=10.5.4.1 LOCAL_IP=10.5.4.1

Not sure if these are related to configuring my phone…?

Your client seems to be refusing server’s certificate. Is it valid? Try with some online check tool.

This is not an error. As said in some other thread it is just a notice and is harmless.

ah, problem solved.
The host that is being asked for is not the NS8 FQDN, but the webtop address.

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