Can not connect to imap server that uses TLS1.1

[MarkWieczorek]

Steps to reproduce

I am trying to connect to an email server that is still using the deprectated TLS1.1 However, the nextcloud mail app doesn't allow me to connect, and simply says "IMAP server is not reachable".

On thunderbird, it is possible to change the minimum allowable version of TLS to 1.1. As far as I can tell, there is not an option to to do this in Nextcloud.

Expected behavior

1. When creating an account, the Mail client should give a more useful error messaging, stating that the TLS version is not supported.
2. The nextcloud mail client should allow you to set the minimum version to 1.1, even if it is now deprecated.

Actual behavior

I get the uninformative message "IMAP server is not reachable"

Mail app version

3.2.4

Mailserver or service

No response

Operating system

Ubuntu Linux 22.04.2

PHP engine version

PHP 8.1

Web server

Apache (supported)

Database

PostgreSQL

Additional info

No response

[ChristophWurst]

I noticed this as well but with a server that uses TLSv1.2

[ChristophWurst]

The connection test during auto setup is enable to open a port. The real IMAP connection through Horde fails.

[ChristophWurst]

Connection to IMAP at mail.isp.tld:993 failed. Error connecting to mail server.

in nextcloud.log

Fri, 28 Jul 2023 09:01:35 +0000
Connection to: imap://mail.isp.tld:993/
Connection failed: Error connecting to server.

in horde_imap.lo