Email synchronisation problem

I’ve an own domainname and webhosting space with Netmatters.nl.

Now I’ve made my own email address: name@mydomain.be.
In mailspring I want to see my emails from gmail and from ‘mydomain’. With gmail account no problems but with mydomain I must every time at restart mailspring go to settings => accounts => put in the email password for smtp and imap.
can someone help me what i do wrong?

here error details:
Mailspring Version: 1.9.2-6e14dad1
Platform: win32
Account State: sync_error
Account Provider: imap
IMAP Server: mail.harmonieverbroedering.be
SMTP Server: mail.harmonieverbroedering.be

24288 [2021-11-11 23:05:36.045] [background] [info] syncFolderChangesViaCondstore - Verzonden: modseq 1 to 1, uidnext 1 to 1
24288 [2021-11-11 23:05:36.061] [background] [info] syncFolderChangesViaCondstore - Concepten tom: modseq 1 to 1, uidnext 1 to 1
24288 [2021-11-11 23:05:36.078] [background] [info] syncFolderChangesViaCondstore - Mailspring: modseq 1 to 1, uidnext 1 to 1
24288 [2021-11-11 23:05:36.095] [background] [info] syncFolderChangesViaCondstore - Mailspring.Snoozed: modseq 1 to 1, uidnext 1 to 1
24288 [2021-11-11 23:05:36.095] [background] [info] Sync loop deleting unlinked messages with phase 2.
24288 [2021-11-11 23:05:36.095] [background] [info] Sync loop complete.
24288 [2021-11-11 23:07:01.469] [foreground] [info] Idle exited with code 0
24288 [2021-11-11 23:07:01.493] [foreground] [info] syncFolderChangesViaCondstore - INBOX: modseq 417 to 417, uidnext 331 to 331
24288 [2021-11-11 23:07:01.494] [foreground] [info] Idling on folder INBOX
24288 [2021-11-11 23:07:36.085] [background] [info] Syncing folder list…
24288 [2021-11-11 23:07:36.121] [background] [info] syncFolderChangesViaCondstore - INBOX: modseq 417 to 417, uidnext 331 to 331
24288 [2021-11-11 23:07:36.137] [background] [info] syncFolderChangesViaCondstore - Sent: modseq 17 to 17, uidnext 15 to 15
24288 [2021-11-11 23:07:36.158] [background] [info] syncFolderChangesViaCondstore - Drafts: modseq 1 to 1, uidnext 1 to 1
24288 [2021-11-11 23:07:36.173] [background] [info] syncFolderChangesViaCondstore - Trash: modseq 50 to 50, uidnext 260 to 260
24288 [2021-11-11 23:07:36.188] [background] [info] syncFolderChangesViaCondstore - INBOX.spam: modseq 1 to 1, uidnext 1 to 1
24288 [2021-11-11 23:07:36.204] [background] [info] syncFolderChangesViaCondstore - Junk: modseq 1 to 1, uidnext 1 to 1
24288 [2021-11-11 23:07:36.220] [background] [info] syncFolderChangesViaCondstore - spam: modseq 1 to 1, uidnext 1 to 1
24288 [2021-11-11 23:07:36.235] [background] [info] syncFolderChangesViaCondstore - Prullenbak: modseq 1 to 1, uidnext 1 to 1
24288 [2021-11-11 23:07:36.256] [background] [info] syncFolderChangesViaCondstore - Verzonden: modseq 1 to 1, uidnext 1 to 1
24288 [2021-11-11 23:07:36.273] [background] [info] syncFolderChangesViaCondstore - Concepten tom: modseq 1 to 1, uidnext 1 to 1
24288 [2021-11-11 23:07:36.290] [background] [info] syncFolderChangesViaCondstore - Mailspring: modseq 1 to 1, uidnext 1 to 1
24288 [2021-11-11 23:07:36.308] [background] [info] syncFolderChangesViaCondstore - Mailspring.Snoozed: modseq 1 to 1, uidnext 1 to 1
24288 [2021-11-11 23:07:36.309] [background] [info] Sync loop deleting unlinked messages with phase 1.
24288 [2021-11-11 23:07:36.309] [background] [info] Sync loop complete.
24288 [2021-11-11 23:10:23.328] [metadata] [info] Metadata delta stream timed out.
24288 [2021-11-11 23:10:23.445] [metadata] [info] Will retry in 5 sec.

What happens if you don’t enter the password (rather than the logfile) - do you seen an error or does the account not update or something else? What settings apply to this account (imap and smtp ports and configuration, especially security e.g. TLS/SSL)? Have you tried other settings, to see if they help?