Bug 409809

SUMMARY
Emails are retrieved in Inbox only up to a certain period for some account, and only for some folders.

Gmail: "Inbox" has emails from the beginning (10/2007) up to last November (11/2018). All newer emails are not present. On the other hand, emails under labels (e.g., I have a Gmail label "GitHub" for the emails from GitHub) are there up to now. "Sent" and "Important" folder is updated up to 11/2018 too. "Special" is updated up to now (I guess, the last email there is from 13/06/2019). "All messages" folder is updated up to 11/2018 too.

I have checked IMAP configuration on Gmail, and it is active, without limitation on the number or size of emails that can be retrieved. Change label to an e-mail has strange behavior: if I mark an email as "special" (starred) nothing happen, and the email remains missing in KMail; if I add to an email the "GitHub" label it will be downloaded from KMail, and the system notifies it too. 

Something similar happens with another email account (from my university: @unipd.it), it is synced from the beginning up to 02/2016! Moreover, "draft" and "sent" are empty (and there are plenty of emails inside the corresponding folders on the server). I have checked: on the local subscription settings they are all "subscribed."

On the other hands, my @outlook.com account doesn't seem to have any problem, and all the folders are correctly synced and updated. 

STEPS TO REPRODUCE
I don't know, I try to remove the account and re-activate them but the situation does not change.

OBSERVED RESULT
Missing emails 

EXPECTED RESULT
All emails present

SOFTWARE/OS VERSIONS
Linux/KDE Plasma: 
(available in About System)
Debian GNU/Linux 10 stable
KDE Plasma Version: 4:5.14.5.1-1
KDE Frameworks Version: 5.54.0
Qt Version: 5.11.3
kernel version: 4.19.0-5-amd64
OS-type: 64-bit

ADDITIONAL INFORMATION