"Login failed" without any further information

[phil294]

Describe the bug
When I log in with my custom mail server configuration, very similar to #162 (same ports), the only error message I see is "Login failed". It should work however, my provided login information is definitely correct. But the more immediate problem here is that there doesnt seem to be a way to see the cause of the failure (see screenshot below)

To Reproduce
Occurrence: always
Steps to reproduce the behavior: This will be somewhat verbose as the behavior varies from case to case. The main issue is with point 1:

1. Normal login with custom information:

   • Configure mail settings: Manual settings
   • Custom mail server from https://lima-city.de. See screenshot below for connection details
   • Insert correct credentials and mail address, click "Sign in"
   • Expected behavior: successful login
   • Acutal behavior: Loading progress continues until 86.0%, then error "Login failed" without details

2. Same with detailed information:

   • Insert complete detailed information, including ports
   • Expected / actual behavior: same as 1.

3. Endless loading screen with invalid password:

   • Insert wrong password, then sign in
   • Expected behavior: Error: Invalid credentials
   • Actual behavior: Loading progress continues until 65.0%, then stops and loads forever, not even an error message. Need to kill the app.

4. Without specifying mail server addresses (they do not match the email address domain name):

   • Remove mail server entries
   • Expected behavior: Error: Could not connect to server
   • Actual behavior: Loading progress continues until 80.0%, then error "Login failed" without details

5. With IMAP TLS port:

   • Insert correct mail servers and password like step 1
   • Set IMAP port to 143, leave IMAP Security at "Automatic", then sign in
   • Expected behavior: Same as 1, as lima-city seems to accept port 143 via TLS
   • Actual behavior: Loading progress continues until 86.0%, then error "Login failed" with detailed message (yey!) Could not connect to mail.lima-city.de:143: async_native_tls: error:1408F10B:SSL routines:ssl3_get_record:wrong version number:ssl/record/ssl3_record.c:332:

Screenshots
Login error:

lima-city.de login information:

App information (please complete the following information):

• App version: v0.600.3.1006 – according to Aurora Store, from where I installed it
• Plugin version, Delta Chat Core version, Flutter version: I'm sorry, but I cannot see any way to determine those version numbers.

Smartphone (please complete the following information):

• Device: Samsung Galaxy S4 Mini, see LineageOS Wiki
• OS: MicroG+LineageOS 14.1 (Android 7.1.2)

Additional context
Interestingly, I faced very similar issues with Delta Chat: I could not connect with the lima-city mail server either. In that case, I got the error message that the SMTP connection to port 25 was rejected – even when I typed in SSL/465 which sounds very much like #162 too. But that issue was fixed, it seems. And this isnt Delta Chat, so probably not related.

Internal Bug Tracker.

[Boehrsi]

Thanks for this report. This level of comprehensiveness is pretty pretty rare. That you face something similar with Delta Chat makes totally sense, as we are using the same core / backend under the hood (https://github.com/open-xchange/flutter-deltachat-core) 👍 .