i use nextcloud 18.0.3 with the newest mail app. If i try to create a account, i get the following error message
Creating account failed: Could not connect to IMAP: Error connecting to mail server.
The mail server is a local imap server. The settings in the app are the same like on thunderbird - which is working.
Also i set
'app.mail.verify-tls-peer' => 'false', in the config.php.
Could anybody help to get the mail app working with the local imap server?