IMAP connection failed (dovecot)

Delta Chat version
app=Delta Chat 1.0.2-gplay

Expected behavior
connect to my email server :wink:

Actual behavior
UI shows servername:143: Bad Response: failed to read greeting
the logs show it trying port 993, SSL error
retrying 993,

Steps to reproduce the problem

  1. fill out account details
    2.advanced - fill out detail
    the only non-standard about the setup seems to be my mail server doesn’t live on imap.domain:993 but on mail.domain:993

my server is dovecot - the desktop DeltaChat client runs fine.
(as do other IMAP clients)

Debug logs

12-21 17:05:41.443 18604 18640 E DeltaChat: Response from mail.monkimon.be:143: Bad Response: failed to read greeting
12-21 17:05:41.443 18604 18640 E DeltaChat: 
12-21 17:05:41.443 18604 18640 E DeltaChat: Some providers place additional information in your inbox; you can check them it eg. in the web frontend. Consult your provider or friends if you run into problems.
12-21 17:05:48.540 18604 18640 E DeltaChat: Response from mail.monkimon.be:993: an OpenSSL error
12-21 17:05:48.540 18604 18640 E DeltaChat: 
12-21 17:05:48.540 18604 18640 E DeltaChat: Some providers place additional information in your inbox; you can check them it eg. in the web frontend. Consult your provider or friends if you run into problems.
12-21 17:05:55.593 18604 18640 E DeltaChat: Response from mail.monkimon.be:993: Bad Response: failed to read greeting
12-21 17:05:55.593 18604 18640 E DeltaChat: 
12-21 17:05:55.593 18604 18640 E DeltaChat: Some providers place additional information in your inbox; you can check them it eg. in the web frontend. Consult your provider or friends if you run into problems.
12-21 17:06:02.650 18604 18640 E DeltaChat: Response from mail.monkimon.be:143: Bad Response: failed to read greeting
12-21 17:06:02.650 18604 18640 E DeltaChat: 
12-21 17:06:02.650 18604 18640 E DeltaChat: Some providers place additional information in your inbox; you can check them it eg. in the web frontend. Consult your provider or friends if you run into problems.